Synonyms of 'on form'
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It will take a very fit person to beat me.
Someone who is healthy is well and is not suffering from any illness.
She had a normal pregnancy and delivered a healthy child.
in good shape (informal)
in good condition
alive and kicking
in fine form
in fine fettle
hale and hearty
fit as a fiddle (informal)
right as rain (British , informal)
in fine feather
Thesaurus for on form from the Collins English Thesaurus
If you say that someone is on form , you think that they are performing their usual activity very well .