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