a disposition or arrangement of troops for attacking an enemy unexpectedly from a concealed station. hence: unseen peril; a device to entrap; a snare.-a concealed station, where troops or enemies lie in wait to attack by surprise.-the troops posted in a concealed place, for attacking by surprise; liers in wait.-to station in ambush with a view to surprise an enemy.-to attack by ambush; to waylay.-to lie in wait, for the purpose of attacking by surprise; to lurk.