Get on (someone) to do (something)

To ask or pressure someone to do something.I will get on my friend to return your book tomorrow.

Get on (someone`s) nerves

To irritate someone.The woman's constant complaining is beginning to get on my nerves.

Get on someone’s case

To criticize someone.The boy's mother is always getting on his case when his room is not clean.

Get on one`s high horse

To behave with arrogance.Our boss likes to get on his high horse and give orders to everyone.

Get on in years

To become older.My uncle is getting on in years and is not very healthy.

Get off to a flying start

To have a successful beginning.The new restaurant got off to a flying start when many people came during the first weekend.

Get off the hook

To become free from an obligation.I got off the hook and did not have to clean the classroom after school.

Get off the ground

To make a successful beginning.My uncle's new business never got off the ground and he must try to sell it.

Get off (someone`s) back

To leave someone alone and not bother him or her.I wish that my supervisor would get off my back.

Get off one’s high horse

To become less arrogant.The manager was forced to get off his high horse and act better toward the employees.