(someone's) ears are flapping

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(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

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?
See also: ear, flap

someone's ears are flapping

someone is listening intently in order to overhear something not intended for them. informal
See also: ear, flap