front door

• frontdoor, front-door

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front door (plural front doors)

1. (literal) The door at the main entrance to a building or house, normally fronts onto a street.
2. (by extension) The entire main entrance to a building or house.
3. The habitual or designated main entrance to a room that has more than one door.

   Entry through the toilet's front door.

4. (computing) The normal portal page to a website.
5. (baseball) The path of a pitch which starts inside and then slides over the plate.

   His front door slider is hard to handle.

6. (slang) vagina or penis, as a means of sexual intercourse, contrasted with the anus or "back door"

(main entrance to a building): foredoor

• back door