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yo-yo

noun pl. yo-yos

  1. a spool-like toy attached to one end of a string upon which it may be made to spin up and down
  2. Slang a person regarded as stupid, ineffectual, inept, eccentric, etc.

adjective

Informal up-and-down; fluctuating; variable

intransitive verb yo-yoed, yo-yoing

Informal to move up and down; fluctuate; vary

See yo-yo in American Heritage Dictionary 4

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