When it comes to socks, bicycle wheels, and chopsticks, pairs are essential for success. Such can be the case in certain aspects of grammar, too. When a pair of consonants teams up this way, it’s called a “geminate.” These double consonants are typically pronounced twice or lengthened, as in “midday,” “bubble,” and “roommate.” However, all doubled consonants are considered geminates, even if the sound isn’t altered significantly. “Geminate” can be a noun for the word containing the doubled consonants, an adjective describing the occurrence, and a verb for the speech sound. “Gemination” is also a noun for the grammatical concept. 

“Geminate” shares an etymological root with “Gemini,” the third sign of the zodiac, aptly represented by the twins Castor and Pollux. Both the grammatical usage and the astrological sign trace back to the Latin root geminus, meaning “twin.”  In modern grammar, “geminate” also applies to certain compound words, such as “life force,” “bookkeeper,” and “cat tail,” which all feature double consonants. But the pronunciation of geminates can vary based on dialect. In the South, for example, both “t’s” in “butter” might be pronounced, while in other regions, the second “t” would be undetectable. Pronunciation differences don’t matter to the concept of a geminate, though; the double consonant spelling is what counts.

English isn’t the only language that relies on gemination. In fact, it plays a more prominent role in a language such as Italian, in which a doubled consonant can alter the verb tense. For example, the Italian verb bevve means “drank” (past tense), while beve means “drinks” (present tense). This spelling change causes significant differences in verb tense and overall meaning.

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Geminates also create new words in Japanese, but the double consonant sound is instead represented by a small “tsu” character (っ). For example, きた (or “kita”) means “arrived,” while きった (or “kitta”) means “sliced.” Notice the tsu character っ in the second spelling, indicating gemination.

Perhaps “geminate” is a new word for you, but you likely use gemination in your speech every day, and these examples show that it’s a powerful concept in languages across the world. 

You say “toe-may-toh,” I say “toe-mah-toe.” While this playful phrase highlights the differences between British and English accents, there are many words that are extremely similar across multiple languages. Linguists call these terms “cognates,” meaning they share the same root word or origin. Here are several words that travel across borders and languages, always staying recognizably similar.

The edible chocolate known and loved today comes from the cacao bean, first grown thousands of years ago in the Amazon basin. These beans were so valuable for flavoring food and drink that Indigenous peoples traded the beans as currency when Europeans arrived in the region. The word “chocolate” was first used in European and Mexican writings in the late 1500s — “chocolate” was the Pipil people’s word in the Nahuat language for a cacao bean drink.

As the cacao bean traveled the world, the word “chocolate” became associated with the taste of any of the sweet treats made with the bean, even if they weren’t beverages. Today, whether we call it chocolat (French), čokoláda (Czech), shokolad (Hebrew), or chokolid (Korean), we’re enjoying an item grown and produced by Indigenous Americans thousands of years ago.

This delicious caffeinated beverage first appeared in Yemen around the 15th century. One early name for the drink — qahwah — comes from the Sufi Muslims of Mocha. It is derived from a longer phrase that means “wine of the bean.” There are several accounts from different Europeans who encountered a dark, hot beverage in the Middle East around the late 16th century, and the spellings for the drink include “chaube,” “cavee” “caova,” and “cahue.” By the 18th century, coffee was part of Europeans’ everyday life.

The term “coffee” eventually became the standard spelling for the drink in English circles, and other languages adopted similar phonetics. From the French café and the German Kaffee to the Hindi kofee and Afrikaans koh-fee, the word has stayed remarkably similar across the globe.

While many world languages refer to this tropical fruit as ananas, in English, it’s a pineapple. The fruit was first called nanas (which meant “excellent fruit”) by the South American Indigenous Tupi-Guaraní people. European explorers came across the fruit in the late 1400s and called it a pineapple, because they thought it resembled a pinecone.

Today, the fruit is called a pineapple in English, piña in Spanish, and pinya in Tagalog. However, many more languages use the Tupi version — including French (l’ananas), Swedish (ananas), and German (Ananas).

Being the most recently coined word on this list has helped “taxi” become more widely adopted across the planet. Horse-drawn carriages for hire were ferrying passengers around London as early as 1605, but the word “taxicab” is a late-19th-century invention. With the advent of gas-powered cars (cabs) came a need to measure the distance and the fare. The device to do that was called a taximeter, taken from the French taxe (“tariff”) and mètre (“measuring”). The taximeter monitored the rides of taxicabs, which soon became shortened to just “taxis.” Today, more than 20 languages use some version of the word “taxi,” making it easier for travelers everywhere to hail a ride.

For the most part, two versions of the word “tea” are used worldwide, and we would recognize both in English. One is a variation of “tea,” and the other is a version of the word “chai,” from Hindi. Both terms come from China, where these goods originated hundreds of years ago.

According to some linguists, the “tea” versions are used in countries where traders would have traveled by sea to bring the beverage to locals, such as England (“tea”), Italy (tè), and the Netherlands (thee). The “chai” variations are popular in areas where the leaves would have come via the Silk Road, such as Korea (cha), India (chay), Russia (chay), and Arab countries (shay).

The culinary world is full of strange hybrids such as turducken, sushirritos, and cronuts. You would be forgiven for thinking “eggcorn” falls into this category, too, but as far as we know, you won’t find any movie theaters selling buckets of popcorn topped with scrambled eggs. Instead, “eggcorn” is a linguistic term, used specifically to designate words and phrases that come about due to mishearing or misinterpreting another word or phrase.

One common eggcorn is “all intensive purposes,” which people incorrectly hear instead of “all intents and purposes.” There’s also “duck tape” for “duct tape,” “pre-Madonna” for “prima donna,” and “doggy dog world” rather than “dog-eat-dog world.” In all of these examples, the first version is a misinterpretation of the correct second version, making the former an erroneous eggcorn.

Of course, “eggcorn” is an eggcorn itself — specifically a misinterpretation of the word “acorn.” The Oxford English Dictionary considers the earliest presentation of “eggcorn” in an 1844 letter from S. G. McMahan, who wrote, “I hope you are as harty as you ust to be and that you have plenty of egg corn [acorn] bread.” This example isn’t from a renowned scholar or in famous literature, but 159 years later, it caught the attention of University of Pennsylvania linguistics professor Mark Liberman.

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In a 2003 blog post, Liberman discussed mistaking “acorns” for “egg corns” for the first time in an academic sense. He wondered if there was a word to describe the situation, ultimately determining that extant words like “malapropism” or “mondegreen” weren’t accurate. At the suggestion of a friend, Liberman proposed “egg corn” as a new term for these situations, given the misinterpretation was unique in itself. The term had been adopted as the one-word “eggcorn” and was used in a Boston Globe article about misheard Shakespeare references by 2004 — proving the right word will quickly fill a void.