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Related to shudder: Shudder to Think
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I shudder to think

It is too worrying or unpleasant for me to think about something that might happen or might have happened. I shudder to think what my boss will say when I tell him I lost our biggest client.
See also: shudder, think

I shudder/dread to ˈthink (how, what, etc....)

(informal, often humorous) I am afraid to think or ask myself about something, because the answer might be terrible or unpleasant: I shudder to think when he last had a bath.‘How much more work is there?’ ‘I dread to think!’
See also: dread, shudder, think
References in periodicals archive ?
Take-off shudder evaluates the NVH severity level during take-off.
As far as Ijichi is concerned, Ilarde's film has all the ingredients of a Tidepoint and Shudder release: 'Transformation, sexy heroine and action
Using press releases, social media, and calls to film schools and communities, Shudder spread the word about the event, ultimately receiving about 400 submissions.
When so many high rises all around the UAE and many more being built I shudder to think if this prediction was wrong.
There was no sign of a shudder from Farmer at the prospect of visiting the Ducks, who have lost their last two outings and are just below halfway in the league standings.
Adults and children alike will shudder at the evil Lord Ombra's antics, chuckle at ongoing tiffs between Peter and tiny Tink, and cheer on the starstuff protectors.
One married a German and another a Filipina woman, but I shudder to think what would happen to children like those produced by them if they ever got into the "system" of child adoption/foster care.
Luckily for those who shudder at the idea of the Louisiana government becoming the largest construction firm and residential real estate company on the Gulf Coast, the usufruct revival has yet to worm its way to the state legislature.
I shudder to think how much worse it is now than 10 years ago.
Leon Kass's anti-cloning slogan, "Shallow are the souls that have forgotten how to shudder" ("Bioethics, Bush Style," by Nina Siegal, May issue), invites this reply: Narrow are the souls that cannot comprehend that different souls shudder at different things.
Just as he finished dialing in his intermediate stop's tower frequency, he felt the aircraft shudder.
Regarding the article "Perverted 'Peacemakers'" (June 28 issue), I shudder to think what would happen if America were disarmed under the United Nations.
When it was announced that the bishop would be the guest speaker we would all shudder in anticipation of a long rambling lecture about "my days in China.