peak - definition and synonyms

verb [intransitive] 

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present tense
present participlepeaking
past tensepeaked
past participlepeaked
  1. to reach the highest standard of performance, before becoming less successful

    Many athletes peak in their early 20s.

    The trick about winning elections is not to peak too early in the campaign.

    1. a.
      to reach the highest amount or level, before becoming lower

      Interest rates peaked at 19%.