Meaning of “sweat it out” - Learner’s Dictionary

sweat it out

informal phrasal verb with sweat us uk /swet/ verb [ I ]

to wait nervously for an unpleasant situation to improve or end:

I don't get my exam results till the end of June so I'll just have to sweat it out till then.

(Definition of “sweat it out” from the Cambridge Learner’s Dictionary © Cambridge University Press)