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half-cock

Going off at half-cock means doing something in a rushed, poorly prepared, or half-hearted way — like charging into a situation before you've thought it through.

/hˈæfkɑk/130 viewsLast reviewed Jun 29, 2026+ Add a definition
🇬🇧 British & Irish slang
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UK
#1·Apr 28, 2026UK

Going off at half-cock means doing something in a rushed, poorly prepared, or half-hearted way — like charging into a situation before you've thought it through. In British English it's a classic phrase for plans that flop because someone skipped the preparation. It also describes someone who commits to something but never quite goes all in. If your project launch bombed because nobody tested anything, that's textbook half-cock territory.

They went off at half-cock with the product launch — no beta testers, no PR plan, just vibes.
Origin: From the firing mechanism of flintlock firearms: a half-cocked hammer was locked in an intermediate position to prevent accidental discharge, but firing in that state was unreliable and dangerous, hence doing things prematurely or carelessly. Editorial expansion authored on Slangora.
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UK
#2·Apr 27, 2026UK

(UK) Not with full vigour, half-heartedly.

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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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