seethe /siːð/ BrE AmE verb [intransitive]
[ Language: Old English ; Origin: seothan 'to boil' ]
1 . to feel an emotion, especially anger, so strongly that you are almost shaking SYN fume
seethe with
He was seething with anger.
I was absolutely seething.
2 . be seething (with something) if a place is seething with people, insects etc, there are a lot of them all moving quickly in different directions:
The cellar was seething with spiders.