- on top of something
- on top of something1. Fig. up-to-date on something; knowing about the current state of something. •
Ask Mary. She's on top of this issue.
•This issue is constantly changing. She has to pay attention to it to stay on top of things.
2. Fig. in addition to something. •Jane told Bill he was dull. On top of that, she said he was unfriendly.
•On top of being dull, he's unfriendly.
3. Fig. victorious over something; famous or notorious for something. •It was a close game, but the home team came out on top.
•Bill is on top in his field.
Dictionary of American idioms. 2013.