heavy-duty
severe duty

The works on the second correction were less heavy duty than the first.

My dad warned me the old boy was heavy duty, but this is something else.

But he was signed only days before the season opener and does not seem ready for heavy duty.

He often works with Heavy Duty, who seems to be his best friend.

These valves are usually very heavy duty to stand up to high pressures.

Sooner or later, the administration is likely to put heavy duties on a new list of luxury goods.

"The Seeker after justice that is a heavy duty to place upon one so young," he said quietly.

So prepare yourselves for a few hours of heavy duty, gentlemen.

Then will come the heavy duty - the adoption of legislation that puts the tax and spending programs into effect.

No more boyfriend/girlfriend, this was heavy duty love/ respect, like a kid for a parent.