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Related to lash down: lash out
1. Of rain, to fall very heavily. It's been lashing down for the last hour or so. It's dry at the moment, but with how dark those clouds are it looks like it could lash down at any moment.
2. To tie or strap someone or something down very tightly. In this usage, a noun or pronoun is used between "lash" and "down." Make sure to lash that timber down before we start driving, or else it will all spill out onto the road. They lashed the prisoner down to the table and began torturing him to extract information.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
lash someone or something down
to tie someone or something down. The villain lashed Nell down to the railroad tracks. He lashed down the innocent victim. Lash that cask down so it doesn't wash overboard.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.