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1.
Listening carefully; keenly attentive.

You listen with your ears, so if you are 'all ears' your entire being is listening to someone speak.
I was all ears as Svet told me his exciting story.
by VAKI5 May 10, 2005
24 3
 
2.
eager to listen, keenly attentive
When it comes to gossip, those two are all ears.
by Light Joker August 24, 2005
11 2