Weigh  v. 1 find the weight of. 2 balance in the hands to guess or as if to guess the weight of. 3 (often foll. By out) take a definite weight of (a substance); measure out (a specified weight) (weigh out the flour; weigh out 6 oz). 4 a estimate the relative value, importance, or desirability of. B (foll. By with, against) compare. 5 be equal to (a specified weight). 6 have (esp. A specified) importance; exert an influence. 7 (often foll. By on) be heavy or burdensome (to); be depressing (to).  weigh down 1 bring down by exerting weight. 2 be oppressive to. Weigh in (of a boxer before a contest, or a jockey after a race) be weighed. Weigh in with colloq. Advance (an argument etc.) Boldly. Weigh out (of a jockey) be weighed before a race. Weigh up colloq. Form an estimate of. Weigh one's words carefully choose the way one expresses something. [old english, = carry]