To veer off or miss — to turn away from a target or course (e.g., a shot missing, a vehicle veering off).
弾は的を逸れてしまった。
The bullet missed the target.
濃霧のせいで船が航路をそれた。
Because of the thick fog, the ship veered off course.
車がカーブでそれて電柱にぶつかった。
The car went off course on the curve and hit a utility pole.
To deviate or digress — e.g., a conversation straying off topic, plans going astray.
会議で話が脱線して本題からそれてしまった。
The discussion digressed during the meeting and strayed from the main topic.
計画が予算不足でそれないように注意する。
Be careful that the plan doesn't go off track because of budget shortfalls.
彼の話はすぐにそれて元に戻らなかった。
His talk soon digressed and didn't return to the original point.