from the GNU version of the Collaborative International Dictionary of English
- transitive v. To keep good one's present condition absolutely or relatively; not to fall off, or to lose ground; as, a ship holds her own when she does not lose ground in a race or chase; a man holds his own when he does not lose strength or weight.
- adj. to keep or maintain one's possessions; to yield nothing; esp., to suffer no loss or disadvantage in a contest.
Sorry, no etymologies found.