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]