Yo-yo Definition
yōyō
yo-yo, yo-yos
noun
A spool-like toy attached to one end of a string upon which it may be made to spin up and down.
Webster's New World
One that undergoes frequent abrupt shifts or reversals, as of opinion or emotion; a vacillator.
American Heritage
A person regarded as stupid, ineffectual, inept, eccentric, etc.
Webster's New World
Alternative spelling of yo-yo.
Wiktionary
verb
To undergo frequent abrupt shifts or reversals, as of opinion or emotion; vacillate.
American Heritage
To move up and down; fluctuate; vary.
Webster's New World
Alternative spelling of yo-yo.
Wiktionary
adjective
Up-and-down; fluctuating; variable.
Webster's New World
Origin of Yo-yo
Formerly a trademark. Most likely from Filipino Llokano "yóyo"
From Wiktionary
Originally a trademark
From American Heritage Dictionary of the English Language, 5th Edition
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