He closed the door and drove off.
He painted the number out on the door.
When the door is shut, it is shut forever.
The door was blown to.

hold a door 举行一次门 一. Hold a door open for someone. 为别人开门。 二. Today, I attempted to be nice and hold a door open for a person in a wheelchair. He hit the button to open another door. 今天我好心给一个坐轮椅的人扶着门，他按了另外一道门的开门按钮。 三. Hold a door open for some women and you are likely to get an angry lecture on treating women as inferiors, unable to open doors for themselves. 替有些女性把着门，你有可能会得到关于//www.souquanme.com你将女性认为是低等动物、不能自己开门的愤怒的教训

要看具体语境了~
最普通的含义就是“一道门”，例如：He crossed a door.他穿过了一道门。
A house with a door. 有门的房子。
通往……的途径：A door that will bring him to success.一条可以把他引向成功的途径。
以下是网络上的具体解析：
door
n.
1. (建筑物、房间、壁橱、衣橱、碗橱等的)门=air curtain
2. 有门的房间(或建筑物)
3. 入口，进口，出入口，门口，门道
4. 通道，通路[比喻]门路，途径
5. (房间、房子的)门面
6. 门状物
7. 家，家庭，一家，一户
8. 个人经历
9. 【商业】联号分店
短语
1. A creaking door(或gate)hangs longest on the hinges.[谚语]危扉长不倒，久弱耐苟延。(或：病夫多长寿。)
2. An open door may tempt a saint.[谚语]门户不关紧，圣贤也会起盗心。3. answer the door[口语](听到敲门或门铃声)去开门，应声去开门，应门
4. at death's door在死神的门口，在死亡的边缘，生命危在旦夕，行将就木5. at one's door(或doorstep)
a. 在家门口
b. 在附近，在跟前；靠近，逼近6. be at someone's door
a. 在某人家门口
b. ＝lie at someone's door[亦作be at the door of someone]7. behind closed(或locked)doors
a. 秘密地(的)，背地里(的)，私下地(的)，不公开地(的)
b. 与外界隔绝地，闭门造车地8. be on the door[口语]在门口工作，在门口收票等9. close one's doors
a. [比喻]关门，拒绝(某人)入内，拒而不纳，谢绝
b. 关门停业，破产，倒闭10. close(或shut)the door to (或on, upon, against)
a. 把(某人)关在门外(或门内)
b. 拒(某人)于门外，拒绝接纳，排斥
c. 把(谈判等的)门//www.souquanme.com堵死，堵死…的门路，使没有可能
d. 把(某一情景)掩盖起来，使人看不到11. darken someone's door(s)(或doorway)[通常用于否定句]跨进门槛(或家门)，登门拜访(或造访)12. Every door may be shut but death's door.[谚语]惟有死亡之门常开。(或：人生在世，惟死难逃。)13. (from)door to door
a. 挨家挨户地，从一家门口到另一家门口
b. 从一处(尤指家)直至另一处；从头到尾地，自始至终地14. get in by the back door从后门进入(某处所)；开后门得到(工作)15. have a (或one, one's)foot in the door[口语]获得机会参加[见foot]16. in doors在屋(或室、户)内17. keep open doors (或house, table)盛情款待来客，经常招待客人，凡来访者均以酒食招待；好客18. keep the wolf from the door免于穷困(或挨饿)[见wolf]19. knock at (或force) an open door多此一举20. knock on the door夜晚敲门(恐怖统治的标志)[亦作knock in the night]21. lay(something)at someone's door把(某事)归咎于某人，把(某事)归因于某人 [亦作lay(something)at the door of someone]22. leave a (或the) door open
a搜趣网. 让门敞(或开)着，不把门关死
b. 让(谈判、和谈、协定的)门敞开着；保留可能性23. lie at someone's door(过失、罪行、责任等)应归咎于某人，(某事)应由某人负责24. Lock(或Shut)the stable(或barn)door when(或after)the horse is stolen.[谚语]失马锁厩。(或：贼走关门，为时已晚。)25. next door to
a. 隔壁，在…的隔壁，与…为邻
b. 几乎，接近于，差不多26. on the wrong side of the door被关在门外27. open its doors
a. 开门接纳
b. 开办28. open one's doors to向…开门，接纳29. open the (或a)//www.souquanme.comdoor (或doors) to (或for)[口语]向…开门；使成为可能；为…创造机会(或条件)，向…提供机会(或方便)；为…提供共享信息的手段；导致30. out of doors在(或去)户外，在露天31. packed to the doors被挤得水泄不通32. put someone to the door
a. 要求某人离开，撵走某人
b. 使某人倾家荡产33. see someone to the door送客到门口34. show someone the door[口语]向某人下逐客令，把某人撵走，要某人离开，叫某人滚蛋35. show someone to the door送客到门口36. shut the stable door when the steed is stolen.= Lock the barn door after the horse is stolen.37. slam(或shut)the door in someone's face
a. 给某人吃闭门羹，把某人拒之门外，拒绝某人入内；拒绝接纳；给某人难堪
b. 拒绝见某人；拒绝与某人谈话，拒绝听取某人的意见
c. 不让某人实现其计划(或达到其目的)38. slam (或shut) the door to (或on, upon)=close the door to(或on)39. Sweep before one's own door.[谚语]律人先律己。(或：正人先正己。)40. The back door robs the house.后门盗难防。(意指家贼难防)41. The door must be either shut or open.[谚语]两者必居其一。42. throw open the (或one's) door to
a. 向…敞开大门，欢迎；竭诚招待
b. 给…以机会；给…以可乘之机43. turn someone out of doors (或house)把某人赶出门外44. two(three,等等)doors away(或down, off)隔壁第二家(第三家，等等)45. with closed door(s)私下地，不分开地；秘密地；禁止旁听地46. within doors[口语]在屋(或户、室)内47. without doors
a. 在户外
b. 在家庭(或民族)之外
c//www.souquanme.com. 在会议之外