belt up

verb

To fasten one's seat belt.

Similar
buckle upclose upclam updummy upshut upbutton upbe quietkeep mum
Opposite
belt out
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Meanings

verbbelt up (third-person singular simple present belts up, present participle belting up, simple past and past participle belted up)

present singular third person belts up · participle present belting up · participle past belted up · past belted up

  1. UKintransitiveTo fasten one's seat belt.

    Synonyms: buckle up

  2. UKcolloquialderogatoryimperativeintransitiveregionalTo stop talking or chattering; to shut up.
  3. slangtransitiveTo beat up (someone).

Synonyms & antonyms

verbTo fasten one's seat belt.

Similar
buckle up

antonym(s) of “shut up”

Opposite
belt out

More synonyms by meaning

verbrefuse to talk or stop talking; fall silent

Similar
close upclam updummy upshut upbutton upbe quietkeep mum
Broader
refrainforbear
Also see
be quietbuckle upbutton upclam upclose updummy uppipe downshut one's gobshut upstrap in

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

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

MLA

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

Chicago

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

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