IdiomAnimalsEnglish

chicken out

Meaning: To become too frightened to do something; to lose one's nerve.

Example: “I was going to ask her to dance, but I chickened out at the last second.”

Origin: Built on the same association as the adjective "chicken" for cowardly, which traces back through "chicken-hearted" (1602) to hens historically standing for timidity against the boldness of the rooster. Turning that adjective into a verb — an action rather than a description of character — is the more recent step: backing out of something at the last moment specifically because your nerve failed you, the way a hen was assumed to.

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