Question 1

What does "ice up" mean?

Accepted Answer

For a machine or mechanical part to become coated with ice, causing it to malfunction.

Question 2

How do you use "ice up" in a sentence?

Accepted Answer

The aircraft's engines iced up during the descent through the clouds.

Question 3

Is "ice up" formal or informal?

Accepted Answer

"ice up" is register-neutral — appropriate in both casual and formal contexts. Particularly common in aviation (aircraft wings icing up), automotive (car locks, windshields), and infrastructure contexts (pipes icing up). Used in both British and American English.

ice up

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