(colloquial, humorous) I don't care; I have no interest in that.

(humorous, rare) Synonym of could care less

(archaic) Alternative form of curiosity killed the cat / Too much worry leads to burden.

be carefree

expresses that someone does not care at all about some hypothetical situation becoming reality

Synonym of hallway medicine

(idiomatic) To successfully perform a task or set of tasks which are very important for the accomplishment of a major objective. / (idiomatic, euphemistic) To urinate or defecate.

An expression used when parting, especially to a sick person

(idiomatic, vulgar, emphatic) Synonym of I don't care

If you take care of little things one at a time, they can add up to big things.