open season on

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.
See also: open, season

open season on

A period of unrestrained criticism or attack on something or someone, as in During an election year it's open season on all officeholders. This expression alludes to the period during which one may legally hunt or fish. [Colloquial; c. 1900]
See also: on, open, season