1. boulder

He stood on the boulder.

2. engorge

His stomach engorged.

3. elbow grease

With a little of elbow grease, he made the surface of stove glinting like a new.

4. loath

He is never loath to wash his teeth.

sumnary:

They visited the Hagrid's vegetable patch where there were a few of huge pumpkins. When they went back to the hall, McGonagall told them that their detentions both were what they didn't like to do, swapping the trophy cups with Filch for Ron and answering fans with Lockhart for Harry.