dry behind the ears

dry behind the ears

Mature; well experienced in some situation or for some role. (Often used in the negative.) You boys can't enlist for the army, you aren't even dry behind the ears yet!
See also: behind, dry, ear
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

dry behind the ears

See also: behind, dry, ear
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in classic literature ?
When you fellers was his age, you wa'n't dry behind the ears yet.
I'm dry behind the ears, an' maybe I've learned a few things I oughtn't to before I knew you.
"Not yet dry behind the ears and just old enough to buy a round of drinks, but old enough to die for his country and for you."