—n.
1 a surprise attack by persons (e.g. troops) in a concealed position.
2 a the concealment of troops etc. to make such an attack. b the place where they are concealed. c the troops etc. concealed.
—v.tr.
1 attack by means of an ambush.
2 lie in wait for.
Etymology: ME f. OF embusche, embuschier, f. a Rmc form = 'put in a wood': rel. to BUSH(1)
Useful english dictionary. 2012.