shake in one's boots
and quake in one's bootsFig. to be afraid; to shake from fear. I was shaking in my boots because I had to go see the manager for being late. Stop quaking in your boots, Bob. I'm not going to fire you.
shake in one's shoes/boots, to
To be in a state of terror or extreme nervousness. This vivid image of trembling with fear has been around since about 1800. William Cobbett is recorded as having said it (Political Register, 1818): “This is quite enough to make Corruption and all her tribe shake in their shoes.” See also scared silly.