The-buck-stops-here Definition

phrase

(idiomatic) A statement that no excuses will be made, that the speaker is going to take direct responsibility for matters, rather than pass the responsibility to higher authorities.

Wiktionary

Origin of The-buck-stops-here

Popularized by US president Harry Truman. The phrase is based on the metaphorical expression passing the buck, derived from poker gameplay, that came to mean "passing blame", or absolving oneself of responsibility or concern by denying authority or jurisdiction over a given matter.

From Wiktionary