What is the origin of the idiom "in one fell swoop" and when to use it?

The idiom "in one fell swoop" originated from William Shakespeare's play Macbeth, specifically in Act 4, Scene 3. Macduff used the term to express the sudden and devastating loss of his family. Over time, the expression gained popularity and is now commonly used to emphasize efficiency, speed, and completeness. This expression is employed in both formal and informal settings, such as in discussions about business strategies, political decisions, project management, or personal achievements.