Genesis 32:25 in the World English Bible
When he saw that he didn’t prevail against him, the man touched the hollow of his thigh, and the hollow of Jacob’s thigh was strained as he wrestled.
Context
24 And Jacob was left alone; and there wrestled a man with him until the breaking of the day.
25 And when he saw that he prevailed not against him, he touched the hollow of his thigh; and the hollow of Jacob’s thigh was out of joint, as he wrestled with him.
26 And he said, Let me go, for the day breaketh. And he said, I will not let thee go, except thou bless me.