expression, ichidan verb
A straightforward phrase meaning to open a door, typically a sliding or hinged door. 戸 refers to a door, especially a traditional Japanese sliding door or a general door.
寒いので、戸を開けないでください。
Please don't open the door because it's cold.
彼は静かに戸を開けて部屋に
He quietly opened the door and entered the room.