Dictionary.com
definitions
  • synonyms

slip of the lip

Also, slip of the tongue or pen. An inadvertent mistake in speaking (or writing), as in It was just a slip of the lip that made me say the wrong name, or She didn't mean it; it was a slip of the tongue, or He intended to write “the honorable” but a slip of the pen turned it into “reverend.” The usage with pen dates from the mid-1600s; the others are a century or so younger.

Show More
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.