plumb bob plumbago slate • plumb bond · · · Info · Definitions · Synonyms · Characters · · plumb bob · · Text Common · · Latin · · Scripts 9 · · Length Definitions · · · (noun) the metal bob of a plumb line. Synonyms: plumb, plummet. · · Noun Definition 1 Synonyms · · · plumb · · Synonym 1 plummet · · Synonym 2 clean · · Synonym 3 plum · · Synonym 4 Characters · · space U+0020 b latin small letter b U+0062 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 u latin small letter u U+0075