plank: [13] The etymological idea underlying plank may be ‘flatness’. It comes via planke, a northern dialect version of Old French planche (source of English planchette [19]), from late Latin planca ‘slab’, a derivative of the adjective plancus ‘flat’. This may have come from the same source as Greek pláx ‘flat surface’, ancestor of English placenta. => planchette
plank (n.)
late 13c. (c. 1200 as a surname), from Old North French planke, variant of Old French planche "plank, slab, little wooden bridge" (12c.), from Late Latin planca "broad slab, board," probably from Latin plancus "flat, flat-footed," from PIE *plak- (1) "to be flat" (see placenta). Technically, timber sawed to measure 2 to 6 inches thick, 9 inches or more wide, and 8 feet or more long. Political sense of "item of a party platform" is U.S. coinage from 1848. To walk the plank, supposedly a pirate punishment, is first attested 1789 and most early references are to slave-traders disposing of excess human cargo in crossing the ocean.
例文
1. Frank put the first plank down and nailed it in place.
フランクは最初の厚い板を置いて、それを適切な位置に釘付けにした。
2.Clamp one end of the plank to the edge of the table.