On top of

preposition

Definitions

1.prepositionAtop

2.prepositionVery close to, in any orientation or in time.

"At peak times, a telephone operator must handle a number of calls, one on top of the next."

3.prepositionIn addition to something else.

"[...] and on top of all that, I got a puncture!"

4.prepositionFully informed about, and in control of, something; up to speed with.

"I have sorted out the problems and am now on top of the situation."

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