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yo-yo
WIKTIONARY
yo-yo
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.
  • A volatile market that moves up and down. finance
  • Someone who vacillates. informal
  • A foolish, annoying or incompetent person. informal
Verb
  • To vacillate; to move up and down. intransitive