jack-in-the-box
noun/ˈdʒæk ɪn ðə bɒks/
/ˈdʒæk ɪn ðə bɑːks/
- a toy in the shape of a box with a figure inside on a spring that jumps up when you open the box
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jack-in-the-box
Definition of jack-in-the-box noun from the Oxford Advanced Learner's Dictionary