Meaning : Force to go away. Used both with concrete and metaphoric meanings.
Example :
Drive away potential burglars.
Drive away bad thoughts.
Dispel doubts.
The supermarket had to turn back many disappointed customers.
Synonyms : chase away, dispel, drive away, drive off, run off, turn back
Meaning : Clear out the chest and lungs.
Example :
This drug expectorates quickly.
Synonyms : clear out, expectorate