out of/off plumb, not corresponding to the perpendicular; out of true.

Origin of plumb

1250–1300; Middle English plumbe, probably < Anglo-French *plombe < Vulgar Latin *plumba, for Latin plumbum lead

Related forms

Can be confused

plum plumb

Definition for plumb (2 of 2)


[ pluhm ]
/ plʌm /


J(ohn) H(arold),1911–2001, British historian. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for plumb

British Dictionary definitions for plumb

Derived Forms

plumbable, adjective

Word Origin for plumb

C13: from Old French plomb (unattested) lead line, from Old French plon lead, from Latin plumbum lead
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012