Fudge subsided into what was clearly an aggrieved silence, but it was broken almost immediately by the portrait, which suddenly spoke in its crisp, official voice.
"I hope Luna always commentates from now on Loser’s Lurgy " But Harry was still too angry to see much humor in the situation, and after a while Ron’s snorts subsided.
By the time they had got dressed, padding themselves out with several of Mrs. Weasleys hand-knitted sweaters and carrying cloaks, scarves, and gloves, Ron’s shock had subsided and he had decided that Harry’s new spell was highly amusing; so amusing, in fact, that he lost no time in regaling Hermione with the story as they sat down for breakfast.
There are no more uses of "subside" in the book.
Show samples from other sources
I couldn’t think clearly until the pain subsided.
We had to wait for the noise to subside before we continue our conversation.