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Phrase(s): 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., Phrase(s): rest up (for something)
to take it easy in advance of something tiring. • Excuse me, but I have to go rest up for the concert tonight. • I really need to rest up a while.
McGrawhill's American Idioms And Phrasal Verbs