knuckle under knuckle tooth • knuckling · · · Info · Definitions · Synonyms · Characters · · knuckle under · · Text Common · · Latin · · Scripts 13 · · Length 4 · · Syllables Definitions · · · (verb) consent reluctantly. Synonyms: yield, give in, succumb, knuckle under, buckle under. · · Verb Definition 1 Synonyms · · · yield · · Synonym 1 give in · · Synonym 2 succumb · · Synonym 3 buckle under · · Synonym 4 Characters · · space U+0020 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 k latin small letter k U+006B l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 u latin small letter u U+0075