1.DC[countableC]British EnglishBrE informal a small metal thing that is used to fasten clothes, which works when you press its two parts together 按扣,揿扣,子母扣SYN American English snap
2.poppers[plural] informal an illegaldrug in the form of a liquid, which people take for pleasure by breathing it in 亚硝酸异戊酯〔一种液状违禁药物,吸入后能令人产生快感〕