What can I use for plural-you? Should I use "you all"?

Question

It used to be the case that for the second person singular we would use "thou" and for second person plural we would use "you". These days, the "thou"s have been replaced with "you" except perhaps in the Southern USA.

Now, what if I want to emphasize that I'm addressing the plural rather than the singular? e.g. when talking to a person who's also representing a group? Would it sound super-weird if I said: "Pleased to make you all's acquaintance" instead of "Pleased to make your acquaintance"? Is there another way to say that?

Edit: The register of this phrase would be somewhat informal, almost tongue-in-cheek, within a formal encounter with the representative of the group.

Answer 1

As mentioned in the comments, there are some regions where people say "you all" (or more commonly the contraction "y'all") or "youse", but they're not considered standard English. I don't think there's a single word for the plural "you", but you can say "all of you" to emphasize that you're addressing a group.

I'm very please to meet all of you.

Answer 2

You would make changes elsewhere in the sentence.

In the example you provided there are a few options:

• Pleased to make your acquaintances.

• Pleased to make all of your acquaintances.

These are clues that you mean more than one person.

To add to the commenters, yinz is another informal second person plural to accompany youse and y'all.