This is the 8532nd most frequent Japanese word.
押し込ん
"押し込ん" means "pushed in" or "forced into."
押し込む is used to describe the action of forcefully pressing or inserting something into a space.
彼は箱の中に本を押し込んだ。
He pushed the book into the box.
押し込む is used to depict the act of inserting oneself into a crowded space, such as a train.
混雑した電車に乗るためには自分を押し込む必要がある。
You need to push yourself into crowded trains.
押し込む is utilized in a passive construction, indicating being pushed into a room involuntarily.