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To relax so as to recover, recuperate, regain one's energy. Be sure to rest up tonight—tomorrow's game is going to take everything we've got! We pushed ourselves to the limit on that last project, so the whole team needs a bit of time to rest up.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
rest up (from something)
to recover or recuperate from something tiring. I need about a week to rest up from my long travels. I'll need a few days to rest up.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To relax and replenish energy in preparation for later strenuous activity: The baseball players rested up for the big game.
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.