an enemy / an opponent, a competitor / (historical) the other party in a lawsuit / 的: (historical) in the red-light district, a term of reference used between prostitutes and customers

an enemy / revenge, vengeance / opponent (of the game or conflict) / (archaic, obsolete) marriage partner

的: (historical) (by extension from the red-light district usage) term of third-person reference: that guy, that one

enemy / foe

to rival

(sumo) abisetaoshi, backward force-down; a kimarite in which the attacker forces his opponent over backwards by throwing his weight into him from a grappling position

(colloquial) to make love

(video games) killing one’s opponent with a single blow

hit and run (the military technique of attacking one place and then quickly moving to another before defenders can react)

deck, knock down