thinning

To make thin or thinner.

To become thin or thinner.

“The crowds thinned after the procession had passed: there was nothing more to see.”

To dilute.

To remove some plants or parts of plants in order to improve the growth of what remains.

Process of removing plants or parts of plants to facilitate the growth of other plants

Wood, leaves, or other plant parts removed during the process of thinning

The action or result of reducing thickness, density, or number

Becoming less thick, dense, or numerous

“thinning hair”