To drive back (an assailant, advancing force etc.).
To ward off (a malignant influence, attack etc.).
To cause repulsion or dislike in; to disgust.
To reject, put off (a request, demand etc.).
To save (a shot).
To force away by means of a repulsive force.
To be courageous; to regain one's courage.
Used when encouraging someone to bear or take up a difficult situation.