someone's 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.
See also: ear, flap
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

someone's ears are flapping

someone is listening intently in order to overhear something not intended for them. informal
See also: ear, flap
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
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