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trigger warning

[ trig-er wawr-ning ]
/ ˈtrɪg ər ˌwɔr nɪŋ /
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noun
a stated warning that the content of the immediately following text, video, etc., may cause distressing psychological or physiological reactions, especially in people who have previously experienced a related trauma: The header line of the blog post contains a trigger warning for rape.Abbreviation: TW
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IS and ARE are both forms of which verb?
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Origin of trigger warning

First recorded in 1990–95; trigger (in the sense “something that stimulates or initiates”)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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