What language spells Sunday as dim dom son?

That's a fun riddle! The language that spells Sunday as "dim dom son" is Pig Latin.

Here's how it works:

* Take the first letter of the word and move it to the end.

* Add "ay" to the end.

So, "Sunday" becomes "unday-s" and then "unday-say", which sounds like "dim dom son" when spoken.