sapper Meaning, Definition & Usage
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noun a military engineer who lays or detects and disarms mines
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noun a military engineer who does sapping (digging trenches or undermining fortifications)
WordNet
Sap"per noun
Etymology
Cf. F.Definitions
One who saps; specifically (Mil.) , one who is employed in working at saps, building and repairing fortifications, and the like.