waku
1.

To reach a temperature where water transforms into steam and bubbles, indicating that it is boiling or has been heated sufficiently, as seen in scenarios like a pot of water or a bath.

2.

To experience a state of excitement or heightened emotions among an audience, often triggered by events such as a discussion or the entrance of a performer.

3.

To naturally emerge or spring forth from the ground, as in the case of underground water or minerals surfacing without external assistance.

4.

To undergo a process of fermentation where bubbles are produced, typically associated with ingredients like rice bran in traditional Japanese dishes.

5.

To have feelings or thoughts that can no longer be contained, reflecting a spontaneous surge of interest, confidence, or emotions.

Example:

薬缶のお湯が沸いている。