Performing, working, or functioning especially well. Hyphenated if used before a noun. After that terrible rehearsal, it's a miracle that we were so on song for the concert. It seems that their goalie is on song again after that serious injury last season.
on songBRITISH, JOURNALISM
COMMON If a sports player is on song, they are playing very well. When I was on song, I knew my opponents couldn't stop me. The whole team was on song.
on songperforming well; in good form. British informal
1996 Times The horse is in pretty good shape. I rode him out at Haydock and he felt on song.