flop sweat noun a panic associated with the possibility of failure, whether or not actual perspiration is involved US,1966
I’ve got flopsweat! — Charles Ludlum, StageBlood, p. 121, 1974
“Flop sweat,” they call it in the theater. Many capable, decent people are so frightened of failure that they won’t even try for success. — Harvey Reese, HowtoLicenseYourMillionDollarIdea, p. 183, 2002