get on with it—continue with what one is doing:
- My partner is drinking too much but every time I mention it we end up arguing—should I just let him get on with it?
get with it—(coll.) respond to new ideas, styles, etc.; become modern:
- My wish to you, especially the older dairy farmers, is to get with it or the future will be without you.
Note: Neither expression correlates in meaning with the phrase get away with it—go unpunished for doing smth. wrong:
- The law says they can defame you and get away with it if the story is true. Truth is an almost perfect defense in a libel suit.