This means you do something completely. It also means you do something for a long time.
Verb [stem] + 込むPrimary
This means you do something completely. It also means you do something for a long time.
友達と電話で３時間も話し込んでしまった。
I got so absorbed in a phone call with my friend that we talked for three hours.
その問題について深く考え込んでしまい、眠れなかった。
I got too caught up thinking deeply about that problem and couldn't sleep.
雨が降ってきたので、急いで近くの店に駆け込んだ。
Since it started raining, I quickly ran into a nearby store.
あまり一つのことに思い込まない方がいいですよ。
It's better not to get fixated on just one thing.
彼は自分の殻に閉じこもって、誰とも話そうとしない。
He has shut himself up in his own shell and won't try to talk to anyone.
Imagine something moving deep inside. Or filling up a space completely. This can be a real jump into water. It can also mean thinking very deeply. Or talking for a long time. It shows an action done fully.
This is different from "〜直す" (naosu). "〜直す" means to do something again to make it better. "〜込む" means to do something deeply or fully. For example, "書き込む" means to write into something. "書き直す" means to rewrite something.
Don't use this when the verb is a quick action. For example, you can't say "eat deeply" with this ending.
Use this when you want to show someone is too deep into something. It can mean they are stuck or obsessed. For example, 思い込む (omoikomu) means to wrongly think something. 信じ込む (shinjikomu) means to believe without thinking.
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