pop·per
noun/ˈpɒpə(r)/
/ˈpɑːpər/
(also press stud (both British English), North American English snap)
- a type of button used for fastening clothes, consisting of two metal or plastic sections that can be pressed together
摁扣；子母扣 - The popper keeps coming undone.
波普尔不断地被解开。
- The popper keeps coming undone.