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belt up

(slang, transitive) To beat up (someone).

ˈbɛlt ˈʌpBoomerhistorical178 viewsLast reviewed Jun 29, 2026+ Add a definition
🇬🇧 British & Irish slang
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UK
#1·Apr 26, 2026UK

(slang, transitive) To beat up (someone).

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UK
#2·Apr 26, 2026UK

(British, intransitive) To fasten one's seat belt.

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UKAvoid at work
#3·Apr 26, 2026UK

(British, intransitive, colloquial, derogatory, usually in imperative) To stop talking or chattering; to shut up.

For parents

Belt up means: To stop talking or chattering; to shut up.. It is generally derogatory or offensive; worth a quiet word about how it lands on the person being described. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.

For ESL learners

belt up means: To stop talking or chattering; to shut up.. Register: very informal, often derogatory or vulgar. Avoid in formal, business, academic, or polite writing. Even in casual speech the word can offend and is best left out of a learner's active vocabulary. Common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; always check the context before producing it yourself.

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🇬🇧About British & Irish slang slang

UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.

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