to feel very angry but to be unable or unwilling to express it clearly

The rest of the class positively seethed with indignation when Julia won the award. 朱莉娅得奖的时候，全班明显很不服气。

By the end of the meeting he was seething. 会议结束时他气呼呼的。

(of a large number or amount) to move around energetically in a small space

The streets were seething (= busy and crowded) with tourists. 街道上游客摩肩接踵。