fog up

verb

To coat, or become coated, with condensation. To steam up.

“My glasses fogged up when he opened the shower door.”

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Meanings

verbfog up (third-person singular simple present fogs up, present participle fogging up, simple past and past participle fogged up)

present singular third person fogs up · participle present fogging up · participle past fogged up · past fogged up

  1. ambitransitiveTo coat, or become coated, with condensation. To steam up.

    My glasses fogged up when he opened the shower door.

  2. slangtransitiveTo get (someone) drunk.
  3. slangtransitiveTo confuse (somebody).

Synonyms & antonyms

Also see
steam up
Cite this entry
APA

fog up. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/fog%20up

MLA

“fog up.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/fog%20up. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “fog up,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/fog%20up.

Source: fog up on Wiktionary, CC BY-SA 4.0.