Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Characterized by or exhibiting an alternating upward and downward movement.
  • adj. Variable; changeable.
  • adj. Vertical.

from The Century Dictionary and Cyclopedia

  • Plain; direct; unceremonious; downright; positive. Compare up and down, under up, adv.

Etymologies

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