plumb1
• verb 1 measure (the depth of water). 2 explore or experience fully or to extremes. 3 test (an upright surface) to determine the vertical. • noun a lead ball or other heavy object attached to a line for finding the depth of water or determining the vertical on an upright surface. • adverb informal 1 exactly: plumb in the centre. 2 N. Amer. extremely or completely. • adjective vertical. — ORIGIN Latin plumbum ‘lead’.
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