explains that he's waiting for the perfect opportunity to strike at Satoru and wants someone else to weaken that Satoru's presence makes it challenging to kill the Star Plasma Vessel but decides to let others weaken

verdict usually results in the removal of the opponent’s Cursed Technique , which leaves them severely weakened

He was also bound by the family curse that weakened each generation.

swords and poison needles are laced with wisteria extract so that even the strongest Demons can be weakened

Demons grow stronger by consuming humans, and refusing half the population should make Akaza weaker in As a result, his rule doesn’t weaken him.

But with such powers come strict rules, as Muzan forbids unnecessary infighting, fearing it could weaken

His Hymn of Frenzy  weakened opponents, making them take more damage, while Hymn of Strengthening boosted

Eventually, the violence within Eldia weakened them, starting the Great Titan War — a massive civil conflict

The pills weakened Quincy when they had Bankai.

Using Tamayo’s Research To Weaken Muzan Tamayo’s years of research on Muzan’s blood culminated in a poison