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sapper

noun
🔊/ˈsæpə(r)/
🔊/ˈsæpər/
 (British English)
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  1. a soldier whose job is to build or repair roads, bridges, etc.工兵；工程兵Topics War and conflictc2
    Word Originearly 17th cent.: from the verb sap ‘dig a sap (in the sense tunnel or trench)’ + -er.