1. a hollow, depression, or low area of land
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'swale'
ME, shade, prob. < ON svalr,
cool, akin to OE swelan,
to burn, ignite < IE base *swel-