込む
こむ (komu)
to be crowded, to become packed
verb (godan)
Example
週末は電車がとても込みます。
しゅうまつはでんしゃがとてもこみます。
Shuumatsu wa densha ga totemo komimasu.
Trains become very crowded on weekends.
Often used to describe crowded places like trains, restaurants, or streets. Can also be used in compound verbs like 申し込む (to apply) or 飛び込む (to jump in).