faire un couac

Meaning: Making an embarrassing mistake or producing a discordant sound.

Language: French

Literally: to make a squawk

Category: The Absurd

Origin: Couac is 15th-century onomatopoeia, coac, imitating a duck's cry — the word survives as one of the duck's familiar nicknames — and orchestra slang from the following century borrowed the same sound for the ugly, unplanned squawk a clarinet or oboe produces when a reed catches wrong or a note cracks. A singer or a musician who fait un couac has, for one unplanned instant, sounded exactly like the bird the word imitates. The figurative sense — any sudden, embarrassing false note in an otherwise smooth situation — simply carries the same sound outside the concert hall.

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