ounce S3 / aʊns / 名词 [可数名词] ( written abbreviation oz )

1 a unit for measuring weight, equal to 28.35 grams. There are 16 ounces in a pound. → fluid ounce

2 an ounce of sense/truth/decency etc any sense, truth etc at all :

If you had an ounce of sense you wouldn’t believe him!

3 every (last) ounce of courage/energy/strength etc all the courage, energy etc that you have :

Every ounce of attention was focused on our common goal.

4 an ounce of prevention (is worth a pound of cure) used to say that it is better to prevent a problem before it happens than to try to solve it after it has happened

5 not an ounce of fat (on somebody) if there is not an ounce of fat on someone, they are thin and usually look healthy