In Top Form - If you want to say that something is resting on the upper surface of something else, then the proper idiom is on top of, as you noted. Paul's back on top form after his illness. Both appeared in top form. Feeling or doing things as well as possible: Imogen was on top form last night. Imogen was in top form last night. Both appeared on top form. Find synonyms and antonyms for in top form, a phrase that means in a good physical or mental condition or marked by vigorous growth. Our star player didn't have a great season, but she also wasn't in top form, thanks to that. In very good or ideal physical shape.
In very good or ideal physical shape. Imogen was in top form last night. Feeling or doing things as well as possible: Paul's back in top form after his illness. Find synonyms and antonyms for in top form, a phrase that means in a good physical or mental condition or marked by vigorous growth. Both appeared on top form. Imogen was on top form last night. Our star player didn't have a great season, but she also wasn't in top form, thanks to that. Paul's back on top form after his illness. Feeling or doing things as well as possible: Both appeared in top form. If you want to say that something is resting on the upper surface of something else, then the proper idiom is on top of, as you noted.