a snap button;a snap fastener; a press stud; a popper
Definitions (粵典–words.hk)
名詞
鈕嘅一種，由一組一凹一凸嘅鐵或膠片組成，凹凸兩面壓實之後就會互相扣住，要用力先可以分返開（量詞：粒） press-stud; snap fastener, a pair of interlocking discs which are to be sewn onto 2 sides of the clothing and fastened as a button.