That makes two of us. spoken language
I agree with your opinion; me too
A: This room is poorly ventilated. B: That makes two of us.
A: I'm about to go to the park for a run B: That makes two of us.
Used to share ideas or opinions in common with other people in public
Used to say that you understand what someone is saying or suggesting
The origin of this expression is not clear.
Put an end to a bad experience or situation in an especially negative way, usually a series of unpleasant events
I argued with my wife this morning and failing in negotiating with my customer has put the tin lid on my bad day.