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on top of

on top of

 
See:
top
part of speech: phrase
definition 1: in total control.
The police said they were on top of the situation and there's no need to worry.
definition 2: completely familiar with.
She likes to stay on top of new research in the field.
definition 3: in addition to.
Are there any additional fees on top of the basic membership?My project is due Friday, and on top of that, I have a big exam that day.