Answer: letmein

AnswerCrossword Clue
LETMEIN"Open the door!"
LETMEINDoor banger's demand
LETMEINShout during a lockout
LETMEINRapper's demand
LETMEINKnocker's request
LETMEINWhat "knock knock" may mean
LETMEIN"Open up!"
LETMEINBig Bad Wolf's demand