fall away
(from someone or something) 1. Lit. [for something] to drop away from someone or something. The paint is falling away from the sides of the house. Over the years, all the paint fell away.
2. Fig. [for someone] to move back or retreat from someone or something. The soldiers fell away from the line of battle.
3. Fig. to distance oneself from someone; to end an association with someone. The candidate's supporters fell away from her when they heard about the scandal.
fall away
1. Also, fall off. Withdraw one's friendship, support, or allegiance. For example, After the divorce, her friends slowly fell away. [Early 1500s]
2. Also, fall off. Gradually decline in size or strength, as in The breeze slowly fell away, or, as Shakespeare put it ( King Lear, 1:2): "Love cools, friendship falls off, Brothers divide." [Early 1500s]
3. Drift from an established faith, cause, or principles. For example, I fell away from the Catholic Church when I was a teenager. [Early 1500]