Wiktionary
vb. (context transitive idiomatic English) to set someone in opposition to someone else
Usage examples of "pit against".
Until then, it planned to hold the Pit against the blind intruders from the void without letting the enemy race become aware of its existence.
Most of the overroofing brush had been pulled down in his fall, revealing the edge of the pit against the fading sky.
They were gung-ho types who'd happily accept an order to go into a pit against a grizzly bear, armed only with a meat grinder.
And now and then a Mongol delegation would arrive with a couple of their wrestlers, big fellows with chests like barrels, to pit against me.
She had no strength to pit against the thing in her skull because her growing strength had not been hers at all.
I was unarmed, with nothing to pit against the ferocity of the xoph but sheer strength alone.
It was a dream to pit against a nightmare, of D'Angeline heads bowed before the Skaldi sword.