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not (hear) a dicky bird
To not hear, say, or receive a sound, utterance, or item of communication. ("Dicky bird" is sometimes hyphenated.) We've had him detained for four hours, but he won't say a dicky bird to us about his involvement in the robbery. We haven't heard a dicky-bird out of the kids all night—I think one of us should go check on them.
not a dicky birdnot a word; nothing at all. informal
Dicky bird is rhyming slang for ‘word’.
1988 Glenn Patterson Burning Your Own Sammy put his ear to where he thought its heart ought to be: not a dickybird.
not say/hear a ˈdicky bird(British English, informal) say/hear nothing: Don’t look at me! I didn’t say a dicky bird. ♢ We haven’t heard a dicky bird from her for weeks.This idiom is from rhyming slang, in which dicky bird stands for ‘word’.
n. someone who performs oral sex on the penis, usually a homosexual male. (Rude and derogatory.) One of the dicky-lickers started staring at me.