merse
noun
low level ground by a river or shore, often alluvial and fertile
low level ground by a river or shore, often alluvial and fertile
a marsh
Old English merse marsh
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.