get on (with some body) means have a good relationship (e.g. Jon and Bob don’t get on. They’re always arguing)
get on means progress (e.g. How are you getting on in your new job? (= How is it going?))
get on means step onto a vehicle (e.g. The bus was full. We couldn’t get on.)
get on with something means continue doing something you have to do, usually after an interruption (e.g. I must get on with my work. I have a lot to do)
get out of something that you arranged to do means avoid doing it. (e.g. I promised I’d go to the wedding. I don’t want to go, but I can’t get out of it now)
get over something means overcome a problem (e.g. The company will have to close if it can’t get over the new regulations.)
get over something means recover from an illness, loss difficulty (e.g. I just got over the flu and now my sister has it.)
get round something (e.g. I don’t know when I am going to get round to writing the thank you cards.)
get together means meet (e.g. Let’s get together for a BBQ this weekend.)
get up means get out of bed (e.g. I got up early today to study for my exam.)
get up means stand (e.g. You should get up and give the elderly man your seat.)