Etymology

break containment

Today it means: Of a post or piece of media, to be shown to a larger audience than originally intended; typically either to a non-fandom community or to an outside platform. Full definition →

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The story

Originated in this sense the microblogging and social media platform Tumblr. Derived from the title of the horror video game SCP – Containment Breach, set inside a facility in which paranormal entities have escaped containment.

Etymology from Wiktionary, CC BY-SA 4.0.