Definition of jumping jack in English:

jumping jack

Syllabification: jump·ing jack


1A calisthenic jump done from a standing position with legs together and arms at the sides to a position with the legs apart and the arms over the head.
More example sentences
  • After a minute passes they jumped to a standing position and began doing jumping jacks.
  • For a cardio bonus, do 30 seconds of jogging, marching, jumping jacks or split-lunge jumps immediately after each move, then go on to the next move.
  • Over the course of 18 months, I drifted slowly from 220 toward 170, adding in light exercise (walking, jumping jacks, situps).
2A toy figure of a man, with movable limbs.

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Pronunciation: dəˈmôrəˌlīz
cause (someone) to lose confidence or hope; dispirit