listen up

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listen up (third-person singular simple present listens up, present participle listening up, simple past and past participle listened up)

1. (idiomatic, informal) To listen closely; to pay attention.

   I'm only gonna say this once, so you really need to listen up.

   • 1933, Eddie Dooley, Under the Goal Posts:

     His sharp eyes scanned the faces of his charges. "Listen up!" he barked.

This verb is often used in the imperative, as a sentence by itself.