1.
If someone or something gets back to a state they were in before, they are then in that state again.
Then life started to ~ to normal...
I couldn’t ~ to sleep.
PHRASAL VERB: V P to n, V P to n, also V P into n
2.
If you ~ to a subject that you were talking about before, you start talking about it again.
It wasn’t until we had sat down to eat that we got back to the subject of Tom Halliday.
= return
PHRASAL VERB: V P to/onto n
3.
If you get something back after you have lost it or after it has been taken from you, you then have it again.
You have 14 days in which you can cancel the contract and get your money back.
PHRASAL VERB: V n P
4.
If you ~ at someone or get them back, you do something unpleasant to them in order to have revenge for something unpleasant that they did to you. (INFORMAL)
The divorce process should not be used as a means to ~ at your former partner...
I’m going to get you back so badly you’ll never to be able to show your face again.
PHRASAL VERB: V P at n, V n P