出国的英文是go abroad.
例句：
1、我要离职出国。
I'm going to chuck it all in and go abroad.
2、症结在于我们今年担负不起出国的费用。
The crunch is that we can't afford to go abroad this year.
3、老板出国期间由谁代管？
Who's minding the shop while the boss is abroad?
4、今年再度出国是绝无可能的。
Another trip abroad this year is out of the question.
5、出国旅行必须持有护照。
The possession of a passport is essential for foreign travel.
