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]
(..) Nah. Cool. Yeah, it's a total drag, man. Sorry. No sweat. So, where you been stayin'? Dayton set me up. I'm workin' for him now, (..)1993 Free Willy