drink the Kool-Aid
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drink the Kool-Aidverb (US colloquial) To adopt the dogma of a group or leader without fully understanding its ramifications or implications; to participate in dangerous or lethal activities, or in something destined to fail, due to peer pressure.
The phrase “drinking the Kool-Aid” comes from the Jonestown Massacre of 1978, in which hundreds of members of the People’s Temple Agricultural Project in Guyana died after consuming a cyanide-laced powdered soft drink as part of a ritual suicide under the instruction of the cult leader Jim Jones. Many of these deaths are believed to be forced suicide or murder, rather than voluntary.