1. 急钮 四合扣：及骨车 包缝机,锁边机 OVERLOCK MACHINE | 急钮 四合扣 SNAP FASTENER | 夹圈 袖窿 ARMHOLE

2. 按扣：snakeskin蛇皮 | snap fastener按扣 | sneaker膠底帆布運動鞋

3. 四合扣：Metal Pin Buckle 铁线针扣 | Snap Fastener 四合扣 | Turn Locks 拧制

4. 弹簧搭扣：snap fastener 按扣; 揿钮 | snap-fastener 弹簧搭扣 | spring fastener 弹簧扣

noun

1. a fastener used on clothing
    fastens with a snapping sound

    e.g. children can manage snaps better than buttons

    Synonym: snappress stud