If something outstood, it stood out from the others because it was very good or very different.
Outstood is usually a good thing. It means something is special or better than the rest.
Examples:
Her drawing outstood all the others.
The red flower outstood the blue ones.
The tall tree outstood the others in the forest.
The cake outstood all the other food at the party.
His kindness outstood everyone else's.
The bright star outstood all the other stars in the sky.