Underbrush (noun)

1. Bushes and shrubs growing beneath the forest canopy.
2. An area of dense vegetation.

Origin:

Early 19th century: from under- (expressing sub-) + brush.

Examples:

1. The underbrush was so thick that it was difficult to move forward.
2. The underbrush provided excellent cover for the animals.
3. The underbrush was a maze of brambles and vines.
4. The underbrush was full of birds and other wildlife.
5. The underbrush was a source of food and shelter for the indigenous people.