등을 돌려요 · 등을 돌렸어요 · N에게 등을 돌리다
to turn one's back on, to abandon, to break with
Example
가격이 너무 올라서 손님들이 그 가게에 등을 돌렸어요.
Prices went up too much, so customers turned their backs on that store.
Word parts
Literally 'to turn one's back,' the same image as in English.