on top of
Preposition
  1. atop#preposition|Atop
  2. Very close to, in any orientation or in time.
    Living on top of one another in a refugee camp is stressful.
    At peak times, a telephone operator must handle a number of calls, one on top of the next.
  3. (idiomatic) In addition to something else.
    . . . and on top of all that, I got a puncture!
  4. (idiomatic) Fully 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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