(1):

(v. t.) A concealed station, where troops or enemies lie in wait to attack by surprise.

(2):

(v. t.) The troops posted in a concealed place, for attacking by surprise; liers in wait.

(3):

(v. t.) A disposition or arrangement of troops for attacking an enemy unexpectedly from a concealed station. Hence: Unseen peril; a device to entrap; a snare.

(4):

(v. t.) To station in ambush with a view to surprise an enemy.

(5):

(v. i.) To lie in wait, for the purpose of attacking by surprise; to lurk.

(6):

(v. t.) To attack by ambush; to waylay.