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open season (on someone or something)
1. A period of unrestricted hunting on a particular type of animal. Because of the problems with overpopulation, the governor declared open season on deer across the entire state.
2. By extension, a situation or period of time in which someone or something is open to constant, unyielding criticism, scorn, or mistreatment. It's going to be open season if news of this scandal reaches the public. The president seems to be declaring open season on all politicians who disagree with his policies.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
(on some creature) a time of unrestricted hunting of a particular game animal. It's always open season on rabbits around here.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
COMMON If you say that it is open season on someone or something, you mean that a lot of people are criticizing or attacking them. It's been open season on bankers since the recession started. The press has long declared open season on the royals. Note: In hunting, the open season is the period of the year when it is legal to hunt particular types of animals or birds.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012