To drive back; force to return; check the advance of; repulse: as, to repel an assailant.To encounter in any manner with effectual resistance; resist; oppose; reject: as, to repel an encroachment; to repel an argument.To drive back or away: the opposite of attract. See repulsion.Synonyms and Decline, Reject, etc. (see refuse), parry, ward off, defeat.To act with force in opposition to force impressed; antagonize.In medicine, to prevent such an afflux of fluids to any particular part as would render it tumid or swollen.