jumping jack

noun

🔊/ˈdʒʌmpɪŋ dʒæk/

[usually plural] (North American English)

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an exercise in which you stand with your legs together and your arms at your sides and jump to a position with your legs apart and your arms spread out
- I leapt to my feet and executed a series of jumping jacks.我跳了起来，执行了一系列跳千斤顶。
Topics Health and Fitnessc2