/aʊns; auns/
n
1 [C] (abbr 缩写 oz) unit of weight, one sixteenth of a pound, equal to 28.35 grams 盎司（1/16 磅, 等于28.35克）. =>App
5 见附录5.
2 [sing] ~ of sth (infml 口) (used esp with neg vs 尤与动词否定式连用) very small quantity of sth; any 少量; 一点
*She hasn't an ounce of common sense. 她一点儿常识也没有.
* There's not an ounce of truth in his story. 他说的没有一点儿是真的.

n[C]written abbreviationoz
[Date: 1300-1400; Language: Old French;Origin: unce, from Latin uncia 'twelfth part, ounce']
a unit for measuring weight, equal to 28.35 grams. There are 16 ounces in a pound.
→fluid ounce
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!
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.
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
not an ounce of fat (on sb)
if there is not an ounce of fat on someone, they are thin and usually look healthy