Out of gas:
1). Without gasoline (in a car, truck, etc)
2). Tired; exhausted; worn out
这个短语的字面意思是车没有汽油了，但是它的引申义是形容人累得精疲力尽的状态。
造句：
1). This car will be completely out of gas in a few more miles.
2). I have been playing tennis matches for more than three hours, and I’m really out of gas.