- 1[countable] (abbreviation oz.) a unit for measuring weight, 1/16 of a pound, equal to 28.35 grams see fluid ounce
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- 2[singular] ounce of something (informal) (used especially with negatives) a very small quantity of something There's not an ounce of truth in her story. Idioms
it is better to stop something bad from happening rather than try to deal with the problems after it has happened
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