משלי יח:יח פירוש: רש״י

and it separates contentious people Heb. עצומים, these are the litigants, as in (Isa. 41: 21): “‘present your strong points (עצמותיכם).’” As their pleas are strong, they are called עצומים, either an expression of strength or an expression of closing, as in (ibid. 33:15) “and closes (עצם) his eyes.”