kaれるreru
1.

To lose vitality as a plant does when it lacks water, often resulting in wilted leaves and dried stems or branches, indicative of death or dormancy.

2.

To metaphorically describe a decline in vigor or essence, often used to express the loss of energy or passion in a person or concept over time.

3.

To develop a depth or maturity of character or skill, often marked by simplicity and a refined quality, contrasting with the initial exuberance or boldness.

4.

To experience a diminishment of essential resources or qualities, similar to a stream running dry, leading to a lack of what is necessary for sustenance.

5.

To undergo desiccation or drying out, particularly in reference to living beings or organic matter, often implying a definitive end or death.

Example:

その花は水がないために枯れた。