on earth

成語所屬單字earth

on earth — 慣用語

1. used after question words like 'how', 'why', 'what', 'who', 'where' to add stron

1.慣用語
釋義

到底；究竟

used after question words like 'how', 'why', 'what', 'who', 'where' to add strong emphasis, usually showing surprise, anger, or great interest

例句

How on earth did you manage to finish the entire project in one night?

Why on earth would anyone pay so much money for an old, broken bicycle?