call it quits

to end a task or agreement prematurely.

Seeing that Harold and Sue were getting nowhere, the couple decided to call it quits.

Great Debate: Cans Vs. Bottles
Think beer in aluminum cans and you think college parties serving watered-down, light beer, right? Not anymore. More craft breweries are starting to call it quits on bottles and sell beer exclusively in cans, say beer industry experts.
June 18, 2013 - Fox News
Bike for sight: Islander will ride to Ann Arbor to raise awareness
After being through a number of different contact lenses over the years and dealing with discomfort, Emma O’Farrell decided to call it quits and accept that this was how she was going to live.
June 18, 2013 - Ile Camera
Southwest Champaign Mass Transit District Plans To Dissolve
Champaign-Urbana Mass Transit District runs limited bus service to the Stephens Family YMCA in southwest Champaign. After this month either that service will disappear, or a separate transportation district will need to call it quits.
June 17, 2013 - FOX Illinois

call it quits : Popular Idioms in English