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washer

noun
🔊/ˈwɒʃə(r)/
🔊/ˈwɑːʃər/
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  1. a small flat ring made of rubber, metal or plastic placed between two surfaces, for example under a nut to make a connection tight（螺母等的）垫圈
    Topics Engineeringc2
  2. (informal) a washing machine洗衣机 see also dishwasher