dressing room 
noun
1A room in which actors or sports players change clothes before and after their performance or game.I've been in dressing rooms with players who had no knowledge of football....
- There will be an uneasiness in the dressing room and players will wonder what will happen on the training field.
- There is talk of a rift in the dressing room between the older players and some of the younger members of the squad.
1.1A small room attached to a bedroom, used for dressing in and to store clothes.There are four bedrooms, two dressing rooms and two bathrooms on the first floor....
- She described the mid-19th century house as having four good rooms downstairs and five bedrooms and two dressing rooms above.
- It turned out to be the part of the wall that was once a doorway, between a dressing room and a bedroom.
- one-man
- one-man band
- one-man operated
- one-man show
- one man's meat is another man's poison
- one moment (or just a moment)
- one nation
- on end
- oneness
- one-night
- one-nighter
- one-night stand
- one-note
- one of a kind
- one-off
- one of these days
- one of those days
- one of us
- one-old-cat
- one-one
- one-on-one
- one or another (or the other)
- one (or a) step at a time
- one or two
- one-parent