1. an upward movement or surge of water, air, or other fluid
2. a sudden increase or rise in something

Examples

• The upswelling of cold ocean water brought nutrients to the surface.
• There was an upswelling of support for the new policy.
• The upswelling of warm air created favorable conditions for the storm.
• An upswelling of emotion overcame her during the ceremony.
• The upswelling of public interest in the issue surprised officials.
• Scientists studied the upswelling currents in the coastal waters.