if he’s, she’s, etc. a day
成語所屬單字day
if he’s, she’s, etc. a day — 慣用語
1. Used to emphasize that someone is at least a certain age.
1.慣用語
釋義
至少（某年齡）
Used to emphasize that someone is at least a certain age.
例句
She must be sixty if she's a day.
He's seventy if he's a day.