From WordNet (r) 3.0 (2006) :
drive out v 1: force to go away; used both with concrete and metaphoric meanings; "Drive away potential burglars"; "drive away bad thoughts"; "dispel doubts"; "The supermarket had to turn back many disappointed customers" [syn: chase away, drive out, turn back, drive away, dispel, drive off, run off] 2: force or drive out; "The police routed them out of bed at 2 A.M." [syn: rout out, drive out, force out, rouse] 3: clear out the chest and lungs; "This drug expectorates quickly" [syn: expectorate, clear out, drive out]