on all fours with

on all fours with (something)

In agreement or concordance with something; equal with or analogous to something. In modern usage, this phrase is typically used to refer to court cases that establish the same or similar precedent. Given that the case was on all fours with cases already presented to the Supreme Court, overruling it would mean overruling each of those cases in turn.
See also: all, four, on
Farlex Dictionary of Idioms.

on all fours with

equal with; presenting an exact analogy with.
1992 Independent President Saddam's occupation of Kuwait was, he declared, on all fours with Hitler's aggressions.
See also: all, four, on
Farlex Partner Idioms Dictionary
See also:
  • all right
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • (you) wanna make something of it?
  • all for the best
  • a thing of the past
  • a slew of (something)
  • a bird in the hand