(someone's) ears are flapping(redirected from his ears are flapping)
(someone's) ears are flapping
Someone is listening, or trying to listen, to the details of a private conversation. Let's finish this conversation in the meeting room in case people's ears are flapping nearby.
ears are flapping
Said when one suspects that a private conversation is being listened to. If ears are flapping now, we should postpone this discussion until a later time, don't you think?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
someone's ears are flappingsomeone is listening intently in order to overhear something not intended for them. informal
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