Study the information about phrasal verbs + away/back.
1. Away = away from a place
Back = back to a place, a person
You can also say walk away, run away, look away.
Go back, come back, get back.
The woman got into her car and drove away.
I have still got Jane’s keys. I forgot to give them back to her.
2. Get away = escape, leave with difficulty
Get away with something = do something wrong without being caught
Keep away = don’t go near
Give something away = give it to somebody else because you don’t want it any more
Put something away = put it in the place where it is kept, usually out of sight
Throw something away = put it in the rubbish
I kept the letter, but I threw away the envelope.
I parked in a no-parking zone, but I got away with it.
3. Wave back, smile back, shout back
Call/phone/ring back = return a phone call
Get back to = reply to them by phone
Look back on something = think about what happened in the past
Pay back money, pay somebody back.
I sent him an email, but he never got back to me.
I waved to her and she waved back.
Raymond Murphy. English Grammar in Use- Cambridge: CUP, 379p.