I've had it. Let's call it a day.是什么意思？

I've had it. Let's call it a day.

我受不了了。今天就到这儿吧。

ve

abbr. Venezuela 委内瑞拉；

例句
Conclusion The TCD abnormity of VE occurs mainly in intracervical artery system.
结论病毒性脑炎脑血流动力学异常改变以颈内动脉系统为主.

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

it

pron. 它，他，正好是所需的，事实[情况]；n. <美俚>傻瓜，笨蛋，<俚>绝妙的人，理想的东西，登峰造极；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

call

v. 呼唤，喊叫，召唤，叫来，召集，下令，命令，打电话给；n. 喊叫，大声喊，电话联络，必要，理由，要求；

例句
Romania's government issued a last-minute appeal to him to call off his trip.
罗马尼亚政府最后一刻恳请他取消行程。

day

n. 一天，白天，时期，节日；adj. 日间的，逐日的；adv. 每天，经常在白天地；

例句
Avant-garde music to this day has not found general public acceptance.
先锋音乐时至今日都没有得到大众的广泛认可。