Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: seothan 'to boil'

seethe

 verb
     
seethe [intransitive]
1 to feel an emotion, especially anger, so strongly that you are almost shaking [= 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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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