What is the difference between rest and rest up?
Hello..Yesterday I was watching a TV series and during that I heard the actor says: You need to rest up...could you please explain to me the difference between rest and rest up? BTW I face a difficulty to comprehend many of phrasal verbs :)))

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'rest up' is a term often used when someone is ill or has had an injury, and they need some time to recover from this. For example, a sportsperson who has strained a muscle may need to rest up before competing again.

'rest' is a far more general word. You rest or 'have a rest' (GB)  (or maybe 'take a rest' in US Eng) when you are tired.

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I think there is no significant difference. "rest up" is more colloquial but means the same thing.

I would not worry about this and go on to some other English words, phrases, idioms, etc.

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There is very little difference between the two.  The only real difference I can think of is that you can rest a little while standing whereas rest up implies lying or sitting with your feet up.

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Thanks guys

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