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]




