(used after an adjective in the te-form) unbearable / unable to lose to; no match for

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

to slap, to strike, to spank

beat someone into shape

(figuratively) to wear out with one's heart and soul

cry one's eyes out