Hmmm, Foolestroupe, surely you've heard "knocked up" in the sense of "very weary" or "exhausted"?

As in the poem

"He was driving Irish tandem, but perhaps I speak at random -
"I'd forgotten for the moment that you're not all mulga bred -
"That means he had his swag up through having knocked his horse up"

It can also mean brought them to the door by knocking on it.

And why doesn't this spell checker like "mulga"?