Learning English - Grammar, Vocabulary & Pronunciation. Learning English - General & Business English. Common Phrases / expressions in English, not taught in class. Intermediatre level vocabulary. An Idiom a Day. Forum . Penfriends . Test . Online English Lessons . Newsletter . Ask Teacher . Return to this page every day to read a new English idiom. Idiom 28WET BEHIND THE EARSInexperienced / naivePeter is still too wet behind the ears. Acronymes / Initiales 8.