(intr, adverb) to ask to be released from an engagement, obligation, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Other Idioms and Phrases with beg off
Ask to be released from an obligation; turn down an invitation. For example, He's asked me out to dinner three times already, but I have to beg off again, or Mother couldn't take on another committee and so she begged off. [Early 1700s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.