Tra từ two a penny - Từ điển Oxford Advanced Learner 8th

Từ điển Oxford Advanced Learner 8th

two a penny ˌtwo/ˌten a ˈpenny idiom (BrE) (NAmE a ˌdime a ˈdozen)very common and therefore not valuable •Teachers of history are ten a penny. Main entry: ↑penny_idiom