Etymology
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ambush (v.)

mid-14c., embushen, enbushen,inbuchen, "to hide in ambush," from Old French embuschier (13c., Modern French embûcher) "to hide, conceal, lay an ambush," from en- "in" (from PIE root *en "in") + busch "wood," which is apparently from Frankish *busk "bush, woods," or a similar Germanic source (see bush (n.)). The notion probably is "hide in the bush," or "lure into the bush." Related: Ambushed; ambushing.

ambush (n.)

late 15c., embushe, "troops concealed to surprise an enemy," from the English verb or from Old French embusche "an ambush, a trap" (13c., Modern French embûche), from embuschier "to lay an ambush" (see ambush (v.)). Non-military sense from 1570s. Figurative use by 1590s. Earlier was ambushment (late 14c.), from Old French embuschement, Medieval Latin imboscamentum.

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Definitions of ambush
1
ambush (v.)
wait in hiding to attack;
Synonyms: scupper / bushwhack / waylay / lurk / ambuscade / lie in wait
ambush (v.)
hunt (quarry) by stalking and ambushing;
Synonyms: still-hunt
2
ambush (n.)
the act of concealing yourself and lying in wait to attack by surprise;
Synonyms: ambuscade / lying in wait / trap
From wordnet.princeton.edu