So MANY GeT oN...

How can there be so many "get on" to get on with.......?
http://dictionary.cambridge.org/search/british/?q=get+on

collocation:

• get on: to have a good relationship
  we're getting on much better now.
  he doesn't get on with is daughter.
• get on: to manage or deal with a situation, especially successfully
  how are you getting on you new home?
  we are getting on quite well with the decorating.
  I wonder how Michael is getting on in his new job.
• get on: to continue doing something, especially work
  I'll leave you to get on then, shall i?
  Stop talking and get on with it.
  I suppose I could get on with the ironing while i am waitng.
• get on to sth: to start talking about a different subject
  how did we get on to (the subject of) your grandmother's cat?
• get on for: almost
  it was getting on for midnight.
  he must be getting on for 80 now. 
• get on sth: to go onto a bus, train, aircraft, or boat
  i think we got on the wrong bus.