/ plæŋk; NAmE / noun
1.
a long narrow flat piece of wood that is used for making floors, etc. :
a plank of wood
a wooden plank
2.
a main point in the policy of an organization, especially a political party :
The central plank of the bill was rural development.
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IDIOMS
see thick adjective , walk verb
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WORD ORIGIN
Middle English : from Old Northern French planke , from late Latin planca board, feminine (used as a noun) of plancus flat-footed.