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3. thick as a short plank

thick as a short plank

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*thick as a short plank

 and *thick as two short planks

exceptionally dim-witted. (*Also: as ~.) Dumb? He's as thick as a short plank, more like. Oh, I'd not say she was stupid. As thick as two short planks, yes, but stupid? Never!

See also: plank, short, thick