to-and-fro

[ too-uh n-froh ]
/ ˈtu ənˈfroʊ /

adjective

back-and-forth: to-and-fro motion.

noun, plural to-and-fros.

a continuous or regular movement backward and forward; an alternating movement, flux, flow, etc.: the to-and-fro of the surf.

Origin of to-and-fro

First recorded in 1820–30; adj. and noun use of adv. phrase to and (fro)(def 2)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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