underscore

A line drawn or printed beneath text; the character _.

• He walks into the house and picks up a pen. The thought he has is a brilliant idea. He must write it down. Only two words need to be written. The underscore adds importance. / BOUNTY HUNTER

A piece of background music.

To underline; to mark a line beneath text.transitive

• By convention, Rubyists usually underscore their method names.

To emphasize or draw attention to.transitive

• I wish to underscore the importance of proper formatting.