To take a part in the affairs of others; especially, to intermeddle; act in such a way as to check or hamper the action of other persons or things.To clash; come in collision; be in opposition: as, the claims of two nations may interfere; the two things interfere with each other.In farriery, to strike one hoof or the shoe of one hoof against the fetlock of the opposite leg (of the same pair): said of a horse.In physics, to act reciprocally upon one another so as to modify the effect of each, by augmenting, diminishing, or nullifying it: said of waves of light, heat, sound, water, etc. See interference, 5.Synonyms Intermeddle, Intervene, etc. See interpose.In base-ball, to obstruct unfairly a runner when he i s endeavoring to reach a base; also, so to obstruct a catcher or fielder who is endeavoring to handle or throw the ball.In foot-ball, to interpose between a runner and would-be tacklers in order to assist the former.