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Phrase(s): open season (on someone)
Fig. a period of time when everyone is criticizing someone. (Based on open season (on some creature).) • It seems as if it’s always open season on politicians. • At the news conference, it was open season on the mayor., Phrase(s): open season (on some creature)
a time of unrestricted hunting of a particular game animal. • It’s always open season on rabbits around here.
McGrawhill's American Idioms And Phrasal Verbs