posted by rfvv .
1. I think he is honest.
-That makes two of us.(I agree with you.)
2. I don't think he is honest.
- That makes two of us.
(I agree with you.)
(Are the short dialogues correct? What is the origin 'That makes two of us.' Why did they start to use this expression)
3. That makes three of us.
4. That makes four of us.
(Can we use these expressions as well?)
Try the following links;
Both are right. "That makes two of us" means that, at least, we both agree. Depending on the actual tone when said, it can also mean, "nobody else thinks so, but we do."
This can also apply to actions.
"I am going to the football game today."
"Really!? That makes two of us then."
The question about "that makes (3, 4, 5...) Of us" - you CAN say that, but it's done if you are acknowledging that you're playing off the idiom. Those phrases are not normal idiomatric sayings.
I could not find a specific origin. The best I could find in all the pages I looked at was that it began in the "first half of the 1900s."