Shudder to think vs. Shutter to think

Shudder to think

/ˈʃʌdər tə θɪŋk/

To feel worried or fearful at the thought of something unpleasant or bad happening

Examples:

I shudder to think what would've happened if he'd stayed.Shudder to think of the chaos that proposal could unleash.She'd shudder to think of ever returning to those days.

Synonyms:

dreadfear

Antonyms:

bravefaceinvite

Shutter to think

/ˈʃʌtər tu θɪŋk/

An expression used to convey discomfort or fear at the thought of something

Examples:

I shutter to think of the risks involved in that venture.She shudders to think what might happen if they meet again.He shuddered to think how much that could cost them next year.

Synonyms:

This word has no synonyms

Antonyms:

This word has no antonyms

Ways to tell them apart:

• Shudder to think involves a physical reaction to a thought, like a chill or a tremor, indicating fear or disgust.
• Shutter to think involves the closing of shutters, a term primarily used incorrectly by confusing it with shudder.
• Remember, when you are scared or repulsed by an idea, you shudder.
• If you are referring to the act of closing something, shutter is closer, but in context, it's rarely correct.
• Shudder to think is a set phrase, while shutter to think is often a mistaken version of it.