I 'broke into a sweat' as I struggled up the hill. = I 'broke out in a sweat' as I struggled up the hill. [=I began to sweat as I struggled up the hill]
“The car won't start—what are we going to do?” “Don't 'sweat it'. I know all about fixing cars.”
“Thanks a lot for your help.” “'No sweat'.” [=helping was not difficult and I was glad to do it]
(..) We have got no money going down the mountain. When we have got the money on the way back, then you can sweat. Bingo. Move it out! Move it! We hit this place in June, didn't we? (..)1969 Butch Cassidy and the Sundance Kid
(..) South America. One or the other. Let's go to Mexico instead. All they got in Mexico is sweat. There's too much of that here. If we'd been in business during the California gold rush, where would we have gone? (..)1969 Butch Cassidy and the Sundance Kid