Sapper
WordNet
noun
(1) A military engineer who does sapping (digging trenches or undermining fortifications)
(2) A military engineer who lays or detects and disarms mines
WiktionaryText
Noun
- One who saps; specifically, one who is employed in working at saps, building and repairing fortifications, and the like. Often known as a combat engineer or military engineer.
- (British colloquial) an officer or private of the Royal Engineers.