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Debouch emerged in English in the 18th century. It derives from a French verb formed from the prefix dé- ("from") and the noun bouche ("mouth"), which itself derives ultimately from the Latin bucca ("cheek"). (It is not to be confused with debauch, which is from the Old French verb desbauchier, meaning "to scatter, disperse.") Debouch is often used in military contexts to refer to the action of troops proceeding from a closed space to an open one. It is also used frequently to refer to the emergence of anything from a mouth, such as water passing through the mouth of a river into an ocean. The word's ancestors have also given us the adjective buccal ("of or relating to the mouth") and the noun embouchure (the mouthpiece of a musical instrument or the position of the mouth when playing one).