on all fours with (something)

on all fours with (something)

In agreement or concordance with; equal with or analogous to. In modern usage, this phrase is typically used to refer to court cases that establish the same or similar precedent. Stating 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

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