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The meaning and origin of the expression: As thick as two short planks

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As thick as two short planks

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What's the meaning of the phrase 'As thick as two short planks'?

Exceedingly stupid.

What's the origin of the phrase 'As thick as two short planks'?

'Thick' has been used to mean slow-witted or stupid since the turn of the 17th century. Shakespeare used it to good effect in Henry IV, Part. 2, 1600:

Hang him baboon, his wit's as thicke as Tewksbury mustard.

Tewksbury mustard was a variety that was made in the Gloucestershire town from ground English mustard seeds and horseradish, formed into a ball. It was thick and creamy, in fact it still is and is available in Tewksbury and elsewhere in the UK.

As thick as two short planksMost of the 'as X as Y' similes refer to some item (Y) and precede it with some property (X) that Y is well-known to posses. Here 'thick' does double duty. It refers to the obvious lack of wit that a piece of wood would display and also to another meaning of thick, that is, 'short and wide'. Planks of wood are wide and the shorted they are the greater their apparent thickness. Two short planks are even thicker.

The expression 'as thick as two short planks', which is sometimes given in the variant form 'as thick as two planks', is of UK origin and dates from the 1970s. The earliest example of it that I know of in print is in Gordon Honeycombe's novel Adam's Tale, 1974. Memory is fallible and plays no useful part in etymology, but I'll mention anyway that I have a clear recollection of hearing it 'in the wild' earlier than that.

The phrase led to the later adoption, also in the UK, of the single word 'plank' to describe someone thought to be stupid.

See other 'as x as y similes'.

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