0 To sweat about something means to worry or become "stressed out" about it. (Sweat can be a symptom of anxiety.) The expression means, "Don't worry about minor problems." 02br 00 "No sweat," meaning "no problem," is another expression using the word "sweat." 02br 02br 00Are you sure you can get all this done by Friday?02br 00Oh, sure. No sweat. 0-