ReadWriteQuiz
Chinese dictionary
like a thunderclap piercing the ear; (of one's name) resound in one's ears; it has struck my ears like the roar of thunder
先生大名，如雷灌耳，小弟献丑，真是班门弄斧了。
Your great name long since reached my ears like thunder. I am ashamed to show off my incompetence in the presence of an expert like yourself.