open season noun3 •A period of time during the calendar year when authorities within a jurisdiction permit the unrestricted hunting of one or more kinds of animal wildlife."But there weren't many crabs in those days," the old man wandered on. "They were fished out, and they were great delicacies. The open season was only a month long, too." — 1912 •A situation or period in which some activity is routinely carried on."My dear Miss Parker, this is the open season on terrible practical jokes." — 1921 •(figurative) A situation in which someone is endangered, blamed, harassed, or opposed in a sustained manner by a number of others; a situation in which something is endangered or otherwise opposed.In the country of the Clantons there was always an open season on any one of his name. — 1919 formsopen seasons