1(of a liquid) boil or be turbulent as if boiling:the grey ocean seethed
[with object] archaic cook (food) by boiling it in a liquid:others were cut into joints and seethed in cauldrons made of the animal’s own skins
2(of a person) be filled with intense but unexpressed anger:inwardly he was seething at the slight to his authority
3(of a place) be crowded with people or things moving about in a rapid or hectic way:the entire cellar was seething with spiders
[with adverbial of direction] (of a crowd of people) move in a rapid or hectic way:we cascaded down the stairs and seethed across the station (as adjective seething)the seething mass of commuters
