This is the 10034th most frequent Japanese word.
迷い込ん
"迷い込ん" means "wandered into" or "strayed into."
迷い込む is used here to describe unintended entry and getting lost in a physical location.
この森で迷い込んだとき、とても怖かった。
When I got lost wandering into this forest, I was very scared.
迷い込む expresses accidentally entering a location without clear intention.
彼は知らない街に迷い込んでしまったが、地元の人に助けられた。
He wandered into an unfamiliar town but was helped by local residents.
迷い込む metaphorically describes entering an unusual or imagined realm.