if he is a day


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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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

if he (or she) is a day

at 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.
See also: he, if
Farlex Partner Idioms Dictionary © Farlex 2017
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