Bag lady:

A homeless woman, especially one in a big city, who carries her possessions with her, as in a shopping bag.

无家可归的女子，她们通常生活在大城市，把自己的东西背在购物袋中。

Bag it:

Literally, to put or take something in a bag, such as groceries or a meal.

字面意思：将某物装进袋中。例如杂物或食物。

例句：

I'm completely full but the meal was delicious. Could you bag it for me? I'll take it for lunch tomorrow.

我已经完全饱了，但是这顿饭太好吃了。你能帮我包起来吗？我明天午饭还可以吃。

To cancel, abandon, or bring something to an end.

取消、放弃或结束某事。

例句：

After 20 years in the insurance business, I've decided to bag it. I'm going to live my dream as a photographer from now on!

在保险行业呆了20年，我决定放弃了。从现在开始，我要去追寻我的摄影梦。

Hold the bag：

To have responsibility or guilt for something foisted upon oneself; to take the blame for something.

对某件事承担责任或感到愧疚；因为某事承担指责。

例句：

My partner had been cooking the books for years, but I was left holding the bag when the business collapsed.

我的搭档伪造假证好多年，但是当生意失败时，却让我来承担责任。

In the bag：

Achieved or won almost as a certainty.

几乎已经达成目标或者获得胜利。

例句：

Don't start to think we've got this game in the bag, gentlemen. I've seen teams make bigger comebacks than this, so we can't let up.

别以为我们已经拿下比赛了，同志们。我见过有的队伍取得过比这个更大的逆转，所以我们不能松懈。