What is the meaning of Plank?

A long, broad and thick piece of timber, as opposed to a board which is less thick.

A political issue that is of concern to a faction or a party of the people and the political position that is taken on that issue.

Physical exercise in which one holds a pushup position for a measured length of time.

A stupid person, idiot.

That which supports or upholds.

To cover something with planking.

To bake (fish, etc.) on a piece of cedar lumber.

To lay down, as on a plank or table; to stake or pay cash.

To harden, as hat bodies, by felting.

To splice together the ends of slivers of wool, for subsequent drawing.

To pose for a photograph while lying rigid, face down, arms at side, in an unusual place.

A plank.

shelf

(wooden or plastic) plank

plank (physical exercise)

a high wooden fence which completely prevents any seeing-through

planks (collectively)

Source: wiktionary.org