Also means
skeleton key, picklock
Usage Note
Rossignol is the celebrated songbird (Luscinia megarhynchos) immortalised in French poetry and chanson. Its secondary meaning — a skeleton key used by locksmiths or burglars — is informal but widely known. Un rossignol can also mean a slow-selling item stuck in a shop's inventory (informal trade jargon).
Examples
"Le rossignol chante toute la nuit."
Natural Translation
The nightingale sings all night.

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