Meaning of “on top of something” in the English Dictionary

american-english dictionary

"on top of something" in American English

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on top of something

in control of a situation and aware of changes:

The stock market has been unpredictable, and you really have to stay on top of things.

On top of is also used to mean in addition to, esp. something unpleasant:

We missed the bus, and on top of that it started raining.

(Definition of “on top of something” from the Cambridge Academic Content Dictionary © Cambridge University Press)