a movable, usually solid, barrier for opening and closing an entranceway, cupboard, cabinet, or the like, commonly turning on hinges or sliding in grooves.
a doorway: to go through the door.
the building, house, etc., to which a door belongs: My friend lives two doors down the street.
any means of approach, admittance, or access: the doors to learning.
any gateway marking an entrance or exit from one place or state to another: at heaven's door.
to hold someone accountable for; blame; impute.
to allow the possibility of accommodation or change; be open to reconsideration: The boss rejected our idea but left the door open for discussing it again next year.
to be the responsibility of; be imputable to: One's mistakes often lie at one's own door.
to request or order someone to leave; dismiss: She resented his remark and showed him the door.