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]
(..) reunited in Rome... for the first Resistance Rally. What does it say? l'm illiterate. You, too? Twelve hours of blood and sweat... to bring home barely enough to keep from starving. Yet their nets... when they pulled them up, were full. (..)1988 Cinema Paradiso