Etymology
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yo-yo (n.)

1915, apparently from a language of the Philippines. Registered as a trademark in Vancouver, Canada, in 1932, the year the first craze for them began (subsequent fads 1950s, 1970s, 1998). The toy itself is much older and was earlier known as bandalore (1802), a word of obscure origin, "but it was from American contact in the Philippines that the first commercial development was established" [Century Dictionary]. Figurative sense of any "up-and-down movement" is first recorded 1932. Meaning "stupid person" is recorded from 1970. The verb in the figurative sense is attested from 1967.

updated on October 10, 2017

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Definitions of yo-yo from WordNet

yo-yo (n.)
a toy consisting of a spool that is reeled up and down on a string by motions of the hand;
From wordnet.princeton.edu, not affiliated with etymonline.