Answer: tidalwave

AnswerCrossword Clue
TIDALWAVE

Overwhelming surge, as of opinion

TIDALWAVE

Seaside disaster cause

TIDALWAVE

Powerful ocean surge

TIDALWAVE
Result of significant submarine activity
TIDALWAVE
Powerful movement
TIDALWAVEAftermath of Britain's A-test.
TIDALWAVECoastal disaster.
TIDALWAVEAny widespread movement.
TIDALWAVEBurst of feeling.
TIDALWAVETsunami
TIDALWAVETsunami, e.g.
TIDALWAVESwell event?