I 'shudder' at the thought of what might happen. = 'I shudder to think' (of) what might happen. [=I am very worried/fearful about what might happen]
He 'shuddered' [='quivered, trembled'] 'with' fear when he heard the scream.
I felt a 'shudder' [='tremble'] in the floor as the truck drove by.
(..) Fire and bullets can't hurt this guy... ...but this stuff here... ...will kill him. Doesn't it give you a kind of... ...a shudder of electricity through you to be in the same room with me? Not like the shudder you'll get when you lay that rock on him. He can see you coming for miles (..)1978 Superman