heavy–du·ty 
/ˈhɛviˈdu:ti, Brit ˈhɛviˈdju:ti/ adjective
/ˈhɛviˈdu:ti, Brit ˈhɛviˈdju:ti/ adjective [more heavy–duty; most heavy–duty] 1 : designed to do difficult work without breaking
▪ heavy-duty vehicles/machines 2 US : very intense or serious
▪ heavy-duty efforts ▪ a heavy-duty conservative ▪ I need to do some heavy-duty studying. ▪ Her plan is facing some heavy-duty opposition.
▪ heavy-duty vehicles/machines
▪ heavy-duty efforts ▪ a heavy-duty conservative ▪ I need to do some heavy-duty studying. ▪ Her plan is facing some heavy-duty opposition.
