Definition of "derring-do" [derring-do]

• Daring or reckless action. (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.

• "While some of the librarians sit behind the desk, others engage in even more derring-do."
• "But the librarian leadership was fired with derring-do, and they decided to go ahead with their plan to do away with Dewey."
• "But Mr. Ijaz, who has a reputation for grandstanding about his diplomatic derring-do, has released Blackberry chat transcripts with the ambassador that seem to show Mr. Haqqani was one of the authors of the memorandum at the heart of this scandal."