This is the 4655th most frequent Korean word.
거꾸로
"거꾸로" means "upside down" or "in reverse."
거꾸로 is used here to mean 'upside down', indicating the incorrect or reversed orientation of the book.
책을 거꾸로 들고 있으면 읽기가 어려워요.
If you hold the book upside down, it's difficult to read.
거꾸로 is used here to mean 'in the opposite direction', signifying deviation from the intended path.
출발 방향을 거꾸로 갔다가 길을 잃었어요.
I went in the opposite direction of departure and got lost.
거꾸로 is used here to mean 'reversed', referring to the sequence being performed in reverse order.