stand pat
stand firm
hold firm
stand fast

Whether or not it would have stood fast, she never knew.

And if he stood fast, so would those around him, not just here in emergency, but throughout the entire hospital.

The governor has stood fast, saying both houses want to spend too much.

"Because I told my first mate to have the men stand fast."

Throughout any exchange, the boy is described as standing fast.

House negotiators have the public's security on their side and must stand fast.

But at least in their public posture, the Republican leadership was standing fast.

It stood fast in its bed of ice and stones.

The other two men stood fast for a moment, both looking at Modesty.

She knew it was time to run, escape and save herself, but Monica stood fast.