(1):

(v. t.) To drive back; to force to return; to check the advance of; to repulse as, to repel an enemy or an assailant.

(2):

(v. i.) To act with force in opposition to force impressed; to exercise repulsion.

(3):

(v. t.) To resist or oppose effectually; as, to repel an assault, an encroachment, or an argument.