inseam /ɪnˈsiːm/verb 2/ˈɪnsiːm/ noun 1forms 3 verb2 •To fit (trousers) with an inseam. •To impress or mark with a seam or cicatrix. inseam /ˈɪnsiːm/ noun1 •The seam of a trouser up the inside of the leg. formsinseamed · inseaming · inseams