[syn: expectorate, clear out, drive out]
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]