mis·sion creep • n. a gradual shift in objectives during the course of a military campaign, often resulting in an unplanned long-term commitment. ∎ such a development in a nonmilitary context, resulting in undesirable policies or consequences: the IMF's mission creep has been consistently endorsed by the Treasury Department as a way of furthering U.S. economic foreign policy.
"mission creep." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (September 25, 2018). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mission-creep
"mission creep." The Oxford Pocket Dictionary of Current English. . Retrieved September 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mission-creep