jack-in-the-box
noun [ C ] uk/ˈdʒæk.ɪn.ðəˌbɒks/ us/ˈdʒæk.ɪn.ðəˌbɑːks/
玩偶匣（一种儿童玩具，揭开匣盖玩偶即跳出）
a children's toy consisting of a box with a model of a person inside it that jumps out and gives you a surprise when the top of the box is raised
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