colloquial, old-fashioned Very close to; almost; nearly. Hey, don't feel bad that you're still single—shoot, I was might nigh 40 by the time I met my wife! I heard it's going to be might nigh 100 degrees on Saturday. She was might nigh frozen to death by the time we fished her out of that lake.
Rur. very nearly. We mighty nigh lost Mary that time she fell through the ice in the river. That was might nigh the worst night of my life.