'Fall Away' in the Bible

then the priest shall cause the woman to swear with the oath of cursing, and the priest shall tell the woman, "Yahweh make you a curse and an oath among your people, when Yahweh allows your thigh to fall away, and your body to swell;

and this water that brings a curse will go into your bowels, and make your body swell, and your thigh fall away." The woman shall say, "Amen, Amen."

When he has made her drink the water, then it shall happen, if she is defiled, and has committed a trespass against her husband, that the water that causes the curse will enter into her and become bitter, and her body will swell, and her thigh will fall away: and the woman will be a curse among her people.

Of Manasseh also there fell away some to David, when he came with the Philistines against Saul to battle; but they didn't help them; for the lords of the Philistines sent him away after consultation, saying, "He will fall away to his master Saul to the jeopardy of our heads."