the tendency for a task, esp a military operation, to become unintentionally wider in scope than its initial objectives
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
How to use mission creep in a sentence
But “Iran likely has its own limits in terms of mission creep in Syria,” says Vira.
Typically, American hubris has meant overreaching, and "mission creep" has historically been synonymous with disaster.
Think military advisors, the Gulf of Tonkin Resolution and mission creep.Obama’s Syrian “Red Line” Could Return Us To The Mistakes of Iraq | Lloyd Green | May 5, 2013 | THE DAILY BEAST
But if there is anything to be learned from America's use of drones abroad, it is that mission creep follows.
Not afraid of mission creep are the two leading lights of the genre, Courtney Love and Charlie Sheen.Celebrity Rants! Courtney Love, Ashley Judd & More Stars Uncensored | Lizzie Skurnick | April 15, 2012 | THE DAILY BEAST