Abide arc means: The character development chapter where someone stops fighting every battle and learns the hard-earned art of letting things be. An abide arc is often the most underrated transformation a person goes. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.