To hide or conceal troops or people in woods or bushes for the purpose of attacking by surprise.
From Spanish emboscar, from en- (in) + bosque (woods). This is a military term that came into English during the 16th-17th centuries when describing ambush tactics.
Medieval and Renaissance armies would literally station soldiers in forests—the Spanish word became so useful that English speakers adopted it wholesale, showing how specialized military knowledge spread across languages.
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