Etymology
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underbrush (n.)

"shrub and small trees in a forest," 1775, from under + brush (n.2). Originally American English; compare undergrowth, attested in the same sense from 1600.

updated on June 22, 2012

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Definitions of underbrush from WordNet

underbrush (n.)
the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest;
Synonyms: undergrowth / underwood
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.