Definition of "underlining" []

• The act of drawing a line under; underscoring. (noun)
• Emphasis or stress, as in instruction or argument. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The third kind of underlining is the long solid line that points out the solid information: such essentials as topic sentences, specific details, definitions, and summary sentences."
• "And, of note, the air reservists flew fully a third of those hours (the people that Colonel Scanlan and Colonel McCague represent) safely and effectively bringing great credit to our organization in underlining the importance of the reserves to the Canadian forces."
• "It underlines-and in this area underlining is long overdue-that Canada is not a unitary state."