on form

on form

At one's normal or peak level of energy, enthusiasm, positivity, or proficiency. Hyphenated if used before a noun. Wow, their quarterback is really on form today. After being ill for so long, it's great to finally be back on form again. It was another on-form performance from the band last night.
See also: form, on
Farlex Dictionary of Idioms.

on ˈform

(also in (good) ˈform) in a good mental or physical state; doing as well as normal: He’s really on form tonight and is answering all the questions correctly and very quickly. The team are in good form this season.
See also: form, on
Farlex Partner Idioms Dictionary
See also:
  • off form
  • round robin
  • a round robin
  • eleventh hour
  • heads I win, tails you lose
  • black market
  • a light touch
  • wiggy
  • first hand
  • rust bucket