I shudder/dread to think humorous spoken language informal
Said when you mean that you don't want or are afraid to think about something because it is too unpleasant.
This train is too crowded! I dread to think what would happen if there really was an infected person here.
I shudder to think what would have happened if the driver hadn’t swerved in time.
I dread to think what would have happened if I hadn’t been rescued in time.
The origin of this phrase is not clear.
A trouble-maker
Henry is such a shit stirrer.