Green’s Dictionary of Slang

shvitz v.

to sweat.

2001		(con. 1964–8) J. Ellroy Cold Six Thousand 88: They swoon and piss Frank off. They shvitz up his Sy Devore suit.
2002		(con. 1998–2000) J. Lerner You Got Nothing Coming 312: She would, unforced, shvitz like a galley slave in a ‘gym’ three times a week.