Etymology
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yo

as a greeting, 1859, but the word is attested as a sailor's or huntsman's utterance since early 15c. Modern popularity dates from World War II (when, it is said, it was a common response at roll calls) and seems to have been most intense in Philadelphia.

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Dictionary entries near yo

yip

yippee

Yippie

-yl

YMCA

yo

yob

yod

yodel

yoga

yogh