Answer: upsurge

AnswerCrossword Clue
UPSURGESudden increase
UPSURGESpike
UPSURGERapid jump
UPSURGERapid rise
UPSURGERapid increase
UPSURGEHigh rise
UPSURGEAn upward billowing.
UPSURGEIn our group, initially put egg on swelling (7)
UPSURGESudden swell
UPSURGERise
UPSURGEJump
upsurgeto surge up
upsurgeAn upward surge in the strength or quantity of something; an increase