heavy-duty I. \| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷\adjective : able or designed to withstand unusual strain (as from heat, exposure, or wear) < heavy-duty equipment > < a sturdy heavy-duty glove > II. adjective 1.: intensive < heavy-duty interviewing — C.G.Segrè > 2.: important : prominent < a heavy-duty gangster — John Schulian >