Get down to something
To start doing something seriously.
To do something over
To do something again because you did it badly the first time.
To stress someone out
To make someone feel nervous about something
To get somehting over with
To do something just because you wanted it ot finish
To put off something
To postpone something.
To stick with something
To continue to do something
To get around to something
To do something you have been planning to do for a ling time.
To catch up on something
To get up to date with something you are behind on