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English definition of “(as) thick as two short planks”

(as) thick as two short planks

slang
very stupid: He's a very skilled footballer but he's as thick as two short planks.Stupid and sillyOf unsound mind
(Definition of (as) thick as two short planks from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Translations of “(as) thick as two short planks”

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