If you prick up your ears, or if your ears prick up, you suddenly begin to listen very carefully because you have heard something interesting:
To prick them up
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When an animal pricks its ears up, or when its ears prick up, it puts its ears up straight because it is listening carefully to a small sound or one that is far away.
To prick them up meaning & definition 1 of To prick them up.
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If you prick up your ears, or if your ears prick up, you suddenly begin to listen very carefully because you have heard something interesting:
To prick them up meaning & definition 2 of To prick them up.
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