The word is up. Up.

Q2 sometimes likes to go visit C4's room. This is understandable, as she wanted to go pet the dogs.

But, of course, her action upset C4 greatly. Not exactly sure how much of a kerfuffle there was, but C4 put her rightious anger to good use. She made a sign (all by herself! No help on spelling or words!) for her door to keep Q2 out. It read thusly:

Q2, in yours

That would work beautifully if Q2 could read. Really, it would.