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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
Farlex Partner Idioms Dictionary © Farlex 2017