sounding line sounding lead • soundingly · · · Info · Definitions · Synonyms · Characters · · sounding line · · Text Common · · Latin · · Scripts 13 · · Length 3 · · Syllables Definitions · · · (noun) (nautical) plumb line for determining depth. Synonyms: lead line, sounding line. · · Noun Definition 1 Synonyms · · · lead line · · Synonym 1 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 u latin small letter u U+0075