Come At Meaning
(Australia, New Zealand, transitive, slang) To accept (a situation); to agree to do; to try. 
Example: Used other than as an idiom: see come,â€Ž at.
The cleaner will come at 4 o'clock.
To get to, especially with effort or difficulty.
His precise meaning was not easy to come at.
To attack, to harass.
As I backed away, he came at me with a knife.
a. 2001, Paul Keating, quoted in 2001, Brett Evans, The Life and Soul of the Party: A Portrait of Modern Labor, page 17,
â€˜He thought heâ€²d come at the Australian Labor Party from the left. He thought heâ€²d tie up the Catholic Church and the East Timor constituency by coming at Labor from that quarter. Thatâ€²s what it has been all about.â€™
2010, Michael Caulfield (editor), The Voices of War: Australians Tell Their Stories from World War I to the Present, unnumbered page,
Well I went to the recruiting office in Perth and the navy guy bailed me up first, â€²cause they just come at you, like the navy guy comes at you, then the air force, â€²cause theyâ€²ve got to get a quota I guess, and then the navy guy came at me and I told him about aviation and that I was keen on aviation and heâ€²s off on his spiel about Sea Kings [helicopters] and all this sort of stuff and I think he might have fired guns or watched a radar or something on a boat somewhere, but he didnâ€²t really know very much and then the army guy overheard him. He said â€˜Aah. Weâ€²ve got all the helicopters, come over here.â€™
2010, Bob Ellis, One Hundred Days of Summer: How We Got to Where We Are, unnumbered page,
And if we got through that, theyâ€²d come at us again in February or March. Even if weâ€²d got through the parliamentary session, theyâ€²d keep coming at us.
Nah, mate â€“ Iâ€²m not going to come at that again. Too risky.
1922, Australian Parliament, Parliamentary Debates, Volume 100, page 1139,
Mr. O'Loghlen: Do you think a factory would come at that?
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Somehow I donâ€²t think ausadmin or news server managers at large would come at that idea.
2006, Kenneth Stanley Inglis, This is the ABC: The Australian Broadcasting Commission, 1932-1983, page 174,
[â€¦] he would have liked to be a roving correspondent for both the ABC and the BBC, but the BBC would not come at that arrangement.