Call it quits

From Fresh Dictionary

English

Verb

call it quits

1. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) To conclude; to quit or stop an activity.

   If you've been working so long that you're making matters worse, it might be time to call it quits and stop for the night.