白嫖这个词，到目前为止，我看到的最好的equivalent就是freeload这个词。
看这个词的英文解释，非常符合“白嫖”的意思：
To take advantage of the charity, generosity, or hospitality of others.
这个词既可以作为及物动词，也可以作为不及物动词使用。
不及物动词用法，比如：
She has decided not to freeload from friends.
Her boyfriend has been freeloading off her since their first date.
It would be a breach of protocol if we didn't let them freeload at our expense.
作为及物动词，后面通常跟物，比如：
He freeloaded several meals a week.
He spent the summer freeloading his friend's vacation home.
Don't let him freeload your hard work; he needs to contribute too.
科林斯词典上也有一个句子，后面是跟人的。
This kind of nonsense about freeloading public sector employees is continually thrown at public sector bureaucracies.
这个词后面还可以加er，表示这类人。比如：Are you sure you want to date a freeloader?
