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on top

part of speech: phrase
definition 1: at the highest point (of something), or on the uppermost surface (esp. of something that is tall).
The tower fell down when the child tried to put a very large block on top.I got a sundae with a cherry on top.The radio is on top of the refrigerator.
definition 2: over so as to cover (another layer).
I put the blankets on first and the quilt on top.They painted white on top of the red, but you can still see the red.He sprinkled Parmesan cheese on top of his spaghetti.
definition 3: in a dominant position.
It's difficult to stay on top in this business.