Oxford Dictionary English

    open season

    noun
    noun
    BrE BrE//ˈəʊpən siːzn//
    ; NAmE NAmE//ˈoʊpən siːzn//
    [singular]
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  1. 1open season (for something) the time in the year when it is legal to hunt and kill particular animals or birds, or to catch fish, for sport opposite close season Wordfinderhuntchase, falconry, game, hunt, open season, pack, poach, prey, safari, trail
  2. 2open season for/on somebody/something a time when there are no restrictions on criticizing particular groups of people or treating them unfairly It seems to be open season on teachers now.
See open season in the Oxford Advanced American Dictionary
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