from the GNU version of the Collaborative International Dictionary of English
- transitive v. To lay bare, as the roots of a tree.
from The Century Dictionary and Cyclopedia
- To lay bare in cultivation, as the roots of trees.
From Latin ablaqueātus ("loosened, dug up"), past participle of ablaqueō ("to disentangle"), formed from ab- + laqueō ("noose"). (Wiktionary)