1 LIQUID FROM SKIN (I) to have liquid coming out through your skin, especially because you are hot or frightened: I was sweating after the long climb. | sweat heavily/profusely (=sweat a lot) | sweat like a pig informal (=sweat a lot) | sweat buckets informal (=sweat a lot)2 WORK (I) informal to work hard: For years she had struggled and sweated to keep the family fed.(+ over): Tim really sweated over that thesis. | sweat blood (=work very hard)3 WORRY (I) informal to be anxious, nervous, or worried about something: We were all really sweating as we waited for the results. | Don't tell them yet - let them sweat a bit first!4 don't sweat it AmE spoken used to tell someone not to worry about something: Don't sweat it, I'll lend you the money.5 don't sweat the small stuff AmE spoken used to tell someone not to worry about unimportant things6 sweat bullets AmE informal to be very worried, anxious, or frightened7 PRODUCE LIQUID (I) if something such as cheese sweats, liquid from inside appears on its surface8 COOK (T) BrE to heat food gently in a little water or fat: Sweat the vegetables until the juices run out.sweat sth out phrasal verb (T)1 sweat it outa) to continue doing something until it is finished, even though it is difficult: You can't leave the course now. Just sweat it out until the summer.b) to do hard physical exercise: They were sweating it out in the gym.2 to get rid of an illness by making yourself sweat a lot3 sweat your guts out informal to work very hard, especially using physical effort: I've sweated my guts out trying to get this shed built on time.4 sweat sth out of sb AmE informal to find out information from someone by asking lots of questions in a threatening way: Finally they sweated the other names out of him.sweat sth off phrasal verb (T) to lose weight by sweating a lot: He sweated off two pounds in the sauna. 2 noun1 LIQUID ON SKIN (U) liquid that comes out through your skin when you are hot, frightened, or doing exercise: Ian came off the squash court dripping with sweat. | work up a sweat (=to do physical exercise or hard work that makes you sweat) | break out in a sweat (=start to sweat, especially because you are frightened): I was ready to kill the guy, and he didn't even break out in a sweat!2 get into a sweat about sth informal to become nervous or frightened about something: Don't get into such a sweat about it! It's only a test.3 a cold sweat a state of nervousness or fear, in which you start to sweat, even though you are not hot: I woke up from the nightmare in a cold sweat.4 no sweat spoken used to say that you can do something easily: “Are you sure you can do it on time?” “Yeah, no sweat!”5 sweats (plural) AmE informala) clothes made of thick, soft cotton, worn especially for sport; sweat suitb) trousers of this type; sweat pants6 the sweat of sb's brow literary the hard effort that someone has made in their work7 WORK (singular) old-fashioned hard work, especially when it is boring or unpleasant8 (old) sweat old-fashioned someone who has a lot of experience, especially a soldier
Longman dictionary of contemporary English. 2004.