ichidan verb
be about to enter; be on the verge of entering
Describes a state just before entering a place, especially a bath, room, or vehicle. Often used in the progressive form 入りかけている.
彼が風呂に入りかけているときに電話が鳴った。
The phone rang just as he was about to get into the bath.
電車に入りかけたところでドアが
The door closed just as I was about to board the train.