- rush, spate, surge, upsurge - a sudden forceful flow
--1 is a kind of flow, flowing
--1 has particulars: debris surge, debris storm; onrush - surge, upsurge - a sudden or abrupt strong increase; "stimulated a surge of speculation"; "an upsurge of emotion"; "an upsurge in violent crime"
--2 is a kind of increase, step-up