/ siːð; NAmE / verb [ v ]
1.
seethe (with sth) | seethe (at sth) to be extremely angry about sth but try not to show other people how angry you are
SYN fume :
She seethed silently in the corner.
He marched off, seething with frustration.
2.
seethe (with sth) ( formal ) ( of a place ) to be full of a lot of people or animals, especially when they are all moving around :
The resort is seething with tourists all year round.
He became caught up in a seething mass of arms and legs.
3.
( formal ) ( of liquids ) to move around quickly and violently :
The grey ocean seethed beneath them.
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WORD ORIGIN
Old English sēothan make or keep boiling , of Germanic origin; related to Dutch zieden .