Wiktionary
vb. 1 To settle accounts with or to settle claims with 2 To deal with 3 To take into account.
Usage examples of "reckon with".
Even Romans had to reckon with defeat, but to learn that their leader had lost his courage.
I reckon with only three of them I can hold them off for a while, but it's a machine gun against a rifle and the odds don't stack up, three to one and the machine gun, it's only a matter of time.
As far as a Negro could be, Lucullus was a man to reckon with in Covington.
If the war ended tomorrow, he would still be a person to reckon with.
And if folks around here looked cross-eyed at him on account of him not being all White, they'd have to reckon with Margaret Guester, they would, and it'd be a fearsome day for them, they'd have no terror at the thought of hell, not after what she'd put them through.
If there was guile there it was of no sort he could reckon with and he sat in the dirt and pulled off his left boot and reached down into it and took out the small damp sheaf of bills.
I am going with him, if he climbs to the Moon, and if any of those Black Rulers try to stop him, they'll have Sam Gamgee to reckon with, I said.