'Call it a day' is an expression that means that something is about to be stopped. It is a decision that someone would take to discontinue their work or other activities that are currently in existence. 

'Call it a day' is a Phrase that originated from the phrase 'call it half a day'. In the year 1838, this phrase was recorded for the very 1st time to refer an employee who left for home without the workday was over. That is when the attendance records had his workdays mentioned as half a days. Since then, whenever the employees are found not working in the office for the entire workday, their superiors would call it 'half a day' to make sure that their salaries will have deductions according to the no. of half-a-days. Later, this phrase was transformed into 'call it a day' which means that work on that particular day is completely over. In the year 1919, the very first use of 'Call it a day' was recorded and since then, has been used by many people and companies worldwide.

1. I am so tired of working today. I wish the company called it a day.

2. I felt so frustrated when by boss told me to work for one more hour after I already called it a day.

3. The crowd was furious when the umpires called it a day on the last day of the 1st test match between India and Sri Lanka at Kolkata. The match ended in a draw after India was in a winning position.

4. One should never call it a day before getting the job done.

5. Never call it a day before achieving your dreams.

6. When you feel like you have done enough hard work on a day, just call it a day and do the rest tomorrow.

7. Are you always the first person to call it a day at your office daily and run home in a jiff?

8. I am my friends were partying happily for almost 4 hours before we called it a day.

9. If I were the boss of the company where I work, I would always call it a day exactly 15 minutes after I reached the office. Do I sound greedy?

10. It's so tough to continue working at the office after everyone had already called it a day. It makes me feel like I am a security guard at an ATM center.

11. I am feeling sleepy all of a sudden. Let me have a cup of coffee and call it a day.

12. Honeymoon is the only time when no one likes to call it a day.

13. I don't bother you calling it a day. But, make sure that you finish this activity tomorrow without procrastinating it much further.

14. My friend would never call it a day at work until the time reached 6 o' clock in the evening.

15. I wish our history teacher would call it a day before someone faints. We have been tremendously suffering from her lecture for the past 4 hours.