expression, godan verb (-gu)
cross the threshold; pass the threshold
Literally stepping over the raised threshold of a Japanese-style room; often used in set phrases about entering a place or beginning a relationship.
彼は敷居をまたぐのをためらった。
He hesitated to cross the threshold.
敷居をまたいで部屋に入る。
Step over the threshold and enter the room.