Small trees, shrubs, or similar plants growing beneath the taller trees in a forest.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "underbrush" in a sentence
"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."
"It knocked down so many trees that the underbrush is now so thick you can hardly get in the woods."
"In a bee-line, through the underbrush, which is peculiarly dense, very thorny, and very aggressive in that locality, a full half hour was necessary."