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Definition of Yo-yo
1. Noun. A toy consisting of a spool that is reeled up and down on a string by motions of the hand.
Definition of Yo-yo
1. Noun. A toy consisting of a spheroidal or cylindrical spindle having a circular groove in which string is wound; it is used by holding the string in the fingers and reeling the spindle up and down by movements of the wrist. ¹
2. Noun. (finance) A volatile market that moves up and down. ¹
3. Noun. (informal) Someone who vacillates. ¹
4. Noun. (informal) A foolish, annoying or incompetent person. ¹
5. Verb. (intransitive) To vacillate; to move up and down. ¹
¹ Source: wiktionary.com