WordReference Random House Unabridged Dictionary of American English © 2020
John•ny-jump-up  ( jonē jumpup′),USA pronunciation n. 
  1. Plant Biologyany of certain violets, esp. Viola pedunculata, having variously colored flowers.
  2. Plant Biologya small form of the pansy, V. tricolor.
  • 1835–45, American; so called from its rapid rate of growth; see Johnny

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