Translation:I stand with everyone.
If cùng were replaced with với, would the meaning be the same?
Yes, the meaning is the same.
Tham gia câu lạc bộ để cùng cố gắng 6CMWNG
Can "đúng" mean "stand" in the metaphorical sense of "to support/to side with"?
ps. "đứng", not "đúng" which means right, exact