This is the 316th most frequent Vietnamese word.
đỏ
"Đỏ" means "red" in English.
Here, 'đỏ' is used as an adjective describing the color of the rose.
Hoa hồng này có màu đỏ.
This rose is red.
In this sentence, 'đỏ' figuratively expresses 'luckiness' or being 'fortunate'.
Anh ấy quá đỏ nên đã trúng thưởng.
He is so lucky that he won a prize.
Here, 'đỏ' describes the color of the dress as an attribute.