Chaf Lamed Hay –Genesis 18:21, This has been translated Destruction or Altogether or completed or . . . . I think you get the idea about the word in general. The issue is in specific. This verse in question with the leading verse 20, reads as:
[20 And the LORD said: 'Verily, the cry of Sodom and Gomorrah is great, and, verily, their sin is exceeding grievous. 21 I will go down now, and see whether they have done altogether according to the cry of it, which is come unto Me; and if not, I will know.'] JPS 1917, reads the same in 1999 version.
Some translation like the Art Scroll -Stone Edition Tanach, adds the words “then Destruction” following the “come unto Me;”.
O.k. big deal, some people think there should be “Destruction” in this verse. Why does it matter?
That is the real question, “Why does it matter?”. I tell you that for the majority of people in the world it does not matter at all. It does matter to me and apparently it matters to some translators. I can not speak for them, only for me and maybe you will find some value in this also.