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peak

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verb [intransitive] American English pronunciation: peak /pik/ 
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present tense
I/you/we/theypeak
he/she/itpeaks
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.

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