To Turn Away, To Digress, To Deviate
Intransitive verb and Ichidan verb
それる
はぐれる
すぐ話が脇道へ逸れてしまう。
The conversation quickly digressed.
You already learned that 逸らす means "to turn away," so this means that but also to stray.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You haven't learned this reading yet, so here's a mnemonic to help you:
If you're the type of person who starts to stray easily, you'll end up saying sorry (それ) a lot. Even if you don't do it often, if you stray, say sorry!