drop out

to withdraw or quit something like a school or class

Example Sentences:

I am going to drop out from our group, as I don’t get along with the members.

After 10 years at the company, our president dropped out last week. He will be missed.

Henry was unpopular at work because he was always dropping out when things became difficult.

From the News:

Clinton drops out of U.S. presidential race

Media:

Similar idioms:

1. bow out
2. work like a dog