be across something

be across (something)

To accurately grasp or comprehend something, often something complex. Primarily heard in Australia. Thank you for explaining that again—I think I'm finally across it now.
See also: across
Farlex Dictionary of Idioms.

be across something

fully understand the details or complexity of an issue or situation. Australian
See also: across, something
Farlex Partner Idioms Dictionary
See also:
  • a ghost at the feast
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • (you've) got to get up pretty early in the morning to (do something)
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • all right
  • (you) wanna make something of it?
  • all for the best
  • a thing of the past