Groundswell
Definition 1 of 2

Emotion
The term often conveys strong collective feelings.

A groundswell of anger was evident at the protest.
Context
Using 'groundswell' often refers to grassroots movements.

The groundswell for change originated from the community level.
Positive
It usually has a positive connotation indicating beneficial changes.

A groundswell of support for local businesses emerged during the crisis.
Compare with
surgerymovementtrendwavesupport
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