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English definition of “on top of something”

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)
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