Wiktionary
prep. 1 atop#preposition 2 (context idiomatic English) In addition to something else. 3 (context idiomatic English) fully informed about, and in control of something; up to speed with.
Usage examples of "on top of".
After I left work we made love on all fours on the living room rug, then again standing in the shower, then on top of the frigging kitchen counter, her legs wrapped around my waist, while waiting for the microwave to ping.
Schiff put the halo down on top of the desk, where it rocked unsteadily.
Ruby continued her discreet roll-call, Bond tried to fix the names to the faces and otherwise add to his comprehension of this lovely but bizarre group locked up on top of a very high Alp indeed.
I know practically nothing except that a man on top of an alp is making efforts to improve our agriculture and livestock.
He landed in soft snow, with the skeleton on top of him and passed out like a light.
A few minutes later she absently pushed her sunglasses up to rest on top of her head, her gaze fixed on the children in the pool as she tuned out the conversation going on beside her.
Hanson had dug out his house, and then he had cut long strips of prairie sod and laid them on top of one another, to make the front wall.
Laura and Mary stood up on top of that tableland, and looked over the grass tops and the pool to the prairie beyond.
One was made of drawers on top of each other, with two little drawers sitting on its top, and two curved pieces of wood went up and held a big looking-glass between them.
She put it down on top of a volume whose crimson binding had washed out to pressed rose, staining the pages, and looked finally back at Chion.