snap fastener
noun [ C ] UK uk/ˈsnæp ˌfɑːs.ən.ər/ us/ˈsnæp ˌfæs.ən.ɚ/ (US snap)
摁扣，子母扣
a small piece of metal or plastic used to fasten clothes, with two usually round parts, one of which is pushed into the other
Synonym: press stud
See also: fastener