washer
noun [ C ] uk/ˈwɒʃ.ər/ us/ˈwɑː.ʃɚ/
(RING)
（螺丝帽下或管道接口处的）垫圈，垫片
a flat ring of metal, rubber, or plastic that is put somewhere, especially between a screw or bolt and a surface, or between joined pipes, in order to make a better connection between them
(MACHINE)
informal洗衣机（同 washing machine）
a washing machine