Definition of "knock-knock" []

• Attributive form of knock knock (noun)

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• "Only his work and an anthology of knock-knock jokes had kept him from slipping into la-la land."
• "Throw in a few clips that wouldn't make the cut on America's Funniest Home Videos and lame montages of kids telling knock-knock jokes Justin who?"
• "He slammed the door and turned around - as he did so … ‘knock-knock’ on the window again …"