lit. billy goat's horns caught in the fence (idiom from Book of Changes 易经); impossible to advance or to retreat; in an impossible situation; without any way out of a dilemma; trapped
羊角勾挂在篱笆上。形容既不能进，也不能退。
羊角勾挂在篱笆上。形容既不能进，也不能退。
明·许仲琳《封神演义》第三十一回：“前无所往，退无所归，羊触藩篱，进退两难。”