pop up
 n.— «Venezuela, even a generic Venezuela as an example, is a wonderful test case. That is why it is referred to as a “pop up,” an unanticipated threat. I have seen the term “pop up” being used for years to describe small scale contingencies.» —“Pentagon to Venezuela: Who, Us?” by William M. Arkin Washington post Nov. 3, 2005. (source: Double-Tongued Dictionary)

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