Douglas Harper's Etymology Dictionary
Wiktionary
alt. 1 (context transitive sports English) In sports involving offensive and defensive teams, to use two defensive players to guard against the movements of a single offensive player. 2 (context transitive by extension English) To deal with or handle a task or individual person by using a team of two people. vb. 1 (context transitive sports English) In sports involving offensive and defensive teams, to use two defensive players to guard against the movements of a single offensive player. 2 (context transitive by extension English) To deal with or handle a task or individual person by using a team of two people.
WordNet
v. cover with two defensive players
Usage examples of "double-team".
The full-court press, passes out of the double-team, the pick-and-roll, cutting off the passing lanes, a tip-in from a high-flying forward soaring from out of nowhere all constitute a coordination of intellect and athleticism, a harmony of mind and body.