Definition of "head-scratcher" []

• A scratcher for the head. (noun)
• A puzzle. (noun)

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• "However, she does promise a new head-scratcher that sounds just as juicy to hold us over until the second season."
• "Sometimes the unexpected loss stands alone as a solitary head-scratcher."
• "Dave Tollefson, playing in Tuck's stead, said the whole game was a head-scratcher."