Definitions from Wiktionary (jack-in-the-box)

▸ noun:  Children’s toy consisting of a small box from which a male figure pops out unexpectedly after some turnings of a crank.
▸ noun:  (historical) A small but powerful kind of screw, used by burglars to break open safes.
▸ noun:  (obsolete) A con-man who deceived tradesmen by substituting empty boxes for others full of money.
▸ Also see jack-in-the-box


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