wakuwaku
1.

To refer to water or another liquid rising naturally from the ground, often in a continuous flow, as if coming from an underground source.

2.

To describe the sudden onset of emotions or feelings, as in the way happiness or interest can arise unexpectedly and become overwhelming.

3.

To indicate the sudden manifestation or emergence of something, such as ideas or conversations, as if they have appeared out of nowhere.

4.

To denote the appearance or proliferation of small creatures, often in a way that suggests an uncontrollable or widespread emergence.

Example:

彼女の目には涙が湧きあふれていた。