shake in your shoes
shake in (one's) shoes
To be very nervous or afraid, often visibly so. That poor kid is shaking in his shoes up there on stage. I may seem confident when I'm leading a training seminar, but I'm really shaking in my shoes most of the time.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
shake (or quake) in your shoes (or boots)tremble with apprehension.
Farlex Partner Idioms Dictionary © Farlex 2017