Answer: stayout

AnswerCrossword Clue
STAYOUT

"...(and) don't come back!"

STAYOUT

Ignore curfew

STAYOUT

Sign on a moping teen's door

STAYOUT
Don't enter
STAYOUT
Do not enter.
STAYOUTRemain to the end of.
STAYOUT"... of My Dreams," old song
STAYOUTBreak curfew, say