if he is a day
Also found in: Dictionary, Thesaurus, Medical, Legal, Encyclopedia.
if (one) is a day
Used to emphasize that one must be a certain age. How does he keep himself looking so young—he's got to be 60 if he's a day!
See also: if
if he (or she) is a dayat least (added to a statement about the age of a person or thing).
1992 Shashi Tharoor Show Business Lawrence must be fifty if he's a day.