1. call it a day - Verb
2. call it a day - Phrase
stop doing what one is doing
Source: WordNet[...]you don't have to be Sun freakin Tzu to know that real fighting isn't about killing or even hurting the other guy, it's about scaring him enough to call it a day. Max Brooks
Some days, I know beauty techniques like it's my job, and other days I can't do my makeup for the life of me. So I find it easiest to just put on mineral veil and a little mascara and call it a day. I use Physician's Formula and Bare Minerals every day of my life. Christian Serratos
I say 'no' to nothing, 'yes' to moderation. That's how I approach everything. No matter if it's candy or foie gras. When you have the real deal, you're satisfied with that one bite. I say go full throttle and call it a day. Carla Hall
Retiring was hard. I'd spent 15 years doing something I loved, but when you get older everything seems to go. When I started spending too long with the physio and the doctor, I knew it was time to call it a day. But I had no preparation for being retired and I didn't know what to do. Daley Thompson
At midnight, the student decided to call it quits and closed his books Source: Internet
Anderson bowled a couple of overs with the second new ball but then the players decided to call it a day and there were warm fist pumps and also some end-of-bubble handshakes between the sides. Source: Internet