upsurge

verb (used without object), up·surged, up·surg·ing.

1. to surge up; increase; rise: Water upsurged. Crime upsurged.

noun

2. the act of surging up; a large or rapid increase: an upsurge in sales.

verb (ʌpˈsɜːdʒ)

1. (intr) mainly literary to surge up

noun (ˈʌpˌsɜːdʒ)

2. a rapid rise or swell

n.

1928, from up– + surge (n.).