Meaning of “shudder” - Learner’s Dictionary

shudder

verb [ I ] uk us /ˈʃʌdər/

to shake, usually because you are thinking of something unpleasant:

I still shudder at the thought of the risks we took.
She shuddered with horror.
shudder noun [ C ]

(Definition of “shudder” from the Cambridge Learner’s Dictionary © Cambridge University Press)