Wiktionary
vb. To remove from something or to have one's place taken, especially in sports.
Usage examples of "sub out".
We paid the sub out of our own pocket to come in for him so Farom wouldn’.
If there were a Russian sub out there, fifteen or so miles away, there was no way she'd suspect a frigate was nearby.
There was an enemy sub out there, and he now had all sorts of noise from Chicago.
Of course it wasn't likely that the tent roof would really keep a sub out.
CalORI still got itself a state-of-the-art sub out of it, and more than just a paint job for the Gazes.
The thrusters were running at a fraction of their full power, but with the sub out of control he was afraid to run them up higher, afraid that they would simply drive the vessel deeper into the dark hot sea.
But if you press the boundary too hard, or too far, it pushes the sub out of enjoyment and into fear and horror territory.