HyperDic: plumb_rule

English > 1 sense of the expression plumb rule:
NOUNartifactplumb rulea plumb line attached to a narrow board
English > plumb rule: 1 sense > noun 1, artifact
MeaningA plumb line attached to a narrow board.
Broaderplumb line, perpendicularA cord from which a metal weight is suspended pointing directly to the earth's center of gravity

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