I. | ̷ ̷| ̷ ̷ intransitive verb
Etymology: up (I) + surge
: to surge up : rise , increase
II. ˈ ̷ ̷ˌ ̷ ̷ noun
: an act or instance of surging up ; especially : a rapid increase : a sudden rise
a big upsurge of wage claims — Margaret Stewart
the present upsurge of concern for the quality of … teaching — Ellsworth Barnard