be/get on top of something

be on top of (something)

To be in complete control of something; to be fully informed or up-to-date about something. A: "How is the new project going?" B: "Right on track! Jen was on top of it while you were on vacation." I don't know how you're always on top of all the different student issues that are brought to your attention.
See also: of, on, top

get on top of (something)

To get complete control of something; to become fully informed or up-to-date about something. A: "How is the new project going?" B: "Right on track! Jen got on top of it while you were on vacation." I don't know how you get on top of all the different student issues that are brought to your attention.
See also: get, of, on, top
Farlex Dictionary of Idioms.

be/get on ˈtop of something

be able to manage and control problems and difficulties successfully: I’ve finally got on top of my new job but it took a long time.
See also: get, of, on, something, top
Farlex Partner Idioms Dictionary
See also:
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • a spoonful of sugar helps the medicine go down
  • a straw will show which way the wind blows
  • a slew of (something)
  • a crack at (someone or something)
  • all right
  • (you) wanna make something of it?
  • all for the best
  • (have) got something going (with someone)