This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Small trees, shrubs, or similar plants growing beneath the taller trees in a forest.

n. The small trees and other plants that clutter the floor of a forest.

n. Shrubs, small trees, and the like, in a wood or forest, growing beneath large trees; undergrowth.

n. Shrubs and small trees growing under large trees in a wood or forest; brush; undergrowth.

To work in the underbrush, as in cutting and clearing; clear away underbrush from.

n. the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest

"Back early part of December, you've had House and Senate staff starting to meet Democratic staff, starting to thrash out what they call the underbrush -- sort of the easier parts of these Bills where most of the things were the same."

thicket    copse    coppice    brush    brushwood   

thicket   

groundcover   

undergrowth    underwood   

undergrowth    brushwood    bramble    herbage    weed    thicket    greenery    creeper    alder    copse