a specific season or time of year when it is legal to catch or hunt for fish or game protected at all other times by the law.
a period of time in which a person or thing is exposed to criticism, attack, or recrimination: Election year is open season on all incumbents.
Origin of open season
An Americanism dating back to 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for open season
a specified period of time in the year when it is legal to hunt or kill game or fish protected at other times by law
(often foll by on) a time when criticism or mistreatment is commonopen season on women employees
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012