Off the derech
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Sociologically, "off the derech" (literally, "off the path") is a term used by Orthodox Jews to describe someone who has intentionally stopped practicing frumkeit. The phrase is often applied to rebellious teenagers. Teenagers who are not yet "off the derech" but who display signs of rebelliousness from Orthodox norms, such as changes in dress or associating with "off the derech" friends are often referred to as teens at risk.
They are known to use other terms to refer to themselves, including “maskilim” and “lost children”.