English version

mission creep

From Longman Dictionary of Contemporary Englishmission creepˈmission ˌcreep noun [uncountable] American English  a series of gradual changes in the aim of a group of people, with the result that they do something different from what they planned to do at the beginning
Examples from the Corpus
mission creepIt is a case of mission creep gone wildly over the top.
From Longman Business Dictionarymission creepˈmission ˌcreep noun [uncountable] HUMAN RESOURCES a series of gradual changes in the aim of the people who manage a company or organization, with the result that they do something different from what they planned to do at the beginningThe penalty clause in the contract leaves no room for mission creep.
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