Idiom meaning, usage examples, facts

1. Ben is new to this business. He’s wet behind the ears.
2. They haven’t had much experience teaching yet. They’re still wet behind the ears.

Antonym: know the ropes. Similar to: born yesterday. The expression comes from that fact that newly born (young) animals are wet at birth. Because of the close creases behind their ears, this area is usually the last to dry.