in-form - definition and synonyms

adjective [only before noun] 

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/ˈɪn ˌfɔː(r)m/
  1. an in-form athlete or team is performing well and at the expected level

    The in-form Reds are top of the league.

    In-form Dutch sprinter Dafne Schippers eased into the final of the 200 metres at the world championships on Thursday.