Definitions

1. verb

to grow or develop under something, especially a covering such as a canopy or a layer of soil

“The seedlings began to undergrow the bushes in the garden.”

2. noun

the act or process of growing or developing under something

“The undergrow of the young plants was slow due to lack of sunlight.”

3. noun

a layer or growth that develops under a surface, especially a layer of vegetation or roots

“The undergrow of the forest floor was dense and hard to walk through.”