A cockroach is a flat, brownish insect that often lives in warm, dark places in buildings. It is known for being very tough and hard to get rid of.
“Cockroach” comes from Spanish “cucaracha.” English speakers reshaped the word to sound like “cock” + “roach,” even though those parts have nothing to do with the insect.
The “cock” and “roach” in “cockroach” are actually a misunderstanding of the Spanish word “cucaracha.” English basically heard a foreign word, broke it into familiar bits, and created a creepy‑crawly name that makes no logical sense.
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