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salt (something) down
To cover something in salt to dry it. I wouldn't drive on the roads until they've had a chance to salt them down—they're pretty slick at the moment! We salt down the freshest meat and let it dry cure for at least 72 hours.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
salt something down
to place salt on something, such as icy roads. I won't go out until midmorning, after they have salted the roads down. I hope they salt down the roads soon.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To cover something completely in salt in order to preserve it, flavor it, or dry it: The cook salted the eggplant down for four days. Pioneers would salt down meat for the winter.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.