underscore

korostaa

alleviivaus

alleviivata An underline; a line drawn or printed beneath text; the character (unsupported).
puhekieltä A piece of background music.
To underline; to mark a line beneath text.
2011, Matt Aimonetti, MacRuby: The Definitive Guide: Ruby and Cocoa on OS X (page 14)

By convention, Rubyists usually underscore their method names.

I wish to underscore the importance of proper formatting.

The tale thus underscores in expressive form the semiparadoxical fact that traders can lie by telling the truth.