to-and-fro

[too-uhn-froh]
adjective
1.
back-and-forth: to-and-fro motion.
noun, plural to-and-fros.
2.
a continuous or regular movement backward and forward; an alternating movement, flux, flow, etc.: the to-and-fro of the surf.

Origin:
1820–30; adj. and noun use of adv. phrase to and fro, Middle English; see fro (def 2)

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The protests are the latest in a years-running to-and-fro between the groups.
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