Up-and-down Definition

ŭpən-doun
adjective
Going alternately up and down, to and fro, etc.
Webster's New World
Characterized by or exhibiting an alternating upward and downward movement.
American Heritage
Variable; fluctuating.
Webster's New World
Vertical.
Webster's New World
adverb

Upward and downward, alternately.

The tide goes up and down.
My blodd pressure goes up and down.
Wiktionary
(idiomatic) Alternately forwards and backwards along a path.
Walk up and down the corridor.
Wiktionary

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Unscrambles

up-and-down