sweat something ↔ out phrasal verb ( see also ↑ sweat )
1 . to wait anxiously for news that is very important to you:
Charles is sweating it out while the coach decides which players he’s taking to the Olympics.
2 . American English to work very hard on something, especially something difficult:
kids sweating out a test
3 . to do hard physical exercise:
They were sweating it out in the gym.
4 . to get rid of an illness by making yourself sweat a lot