在网络用语中，"拉黑"的英文说法是"to put on a blacklist"或"to block"。这个词的来源可能源于现实生活中，把某人或某事物写在黑色的清单上，表示要被拒绝或排斥。例如：

I blocked her number after she kept calling me at all hours of the night.

The company put his name on the blacklist after he was caught stealing.

"拉黑"的英文例句及其中文翻译如下：

I put him on my blacklist because he is always causing trouble. 我把他拉黑了，因为他总是惹麻烦。

She blocked me on social media after I made a rude comment. 她在社交媒体上把我拉黑了，因为我发了一条无礼的评论。