Origin

Water on the left combines with the character for courage or vigor on the right to show liquid rising up with force and energy. The right component also provides a sound hint for how to pronounce the character. When water moves with this kind of vigorous, rushing quality, it boils, bubbles up, and ferments, which matches the meanings. The image is of water actively stirring and surging, not sitting still.

AI-generated (claude-haiku-4-5), not yet reviewed. Formation type (automated guess): Compound ideographic (combined meanings).