Jack-in-the-box
Full definition of jack-in-the-box
Noun
jack-in-the-box
(plural jacks-in-boxes or jacks-in-the-boxes or jack-in-the-boxes or jacks-in-the-box)- Children’s toy where a figure pops out of a small box.
- (obsolete) A con-man who deceived tradesmen by substituting empty boxes for others full of money.