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- Dictionaryjumping jack/ˈdʒʌmpɪŋ/
noun
- 1. a jump done from a standing position with the arms and legs pointing outwards.
- 2. a small firework producing repeated explosions. dated British
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noun
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A jumping jack, also known as a star jump and called a side-straddle hop in the US military, is a physical jumping exercise performed by jumping to a position with the legs spread wide and the hands going overhead, sometimes in a clap, and then returning to a position with the feet together and the arms at the sides. The name origin for the jumping jack exercise has sometimes erroneously been iden... Wikipedia