(British, NZ, Australia) A solid putty-like adhesive, originally blue in colour, used to secure items to walls and other surfaces.
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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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(British, NZ, Australia) To fix with Blu-Tack.
The power switch wasn't seated properly, and so I blu-tacked it into place.
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