(obsolete, UK, prison slang, transitive) To initiate (a new prisoner) through a ritual involving beating him with sticks and swords, accompanied by music, to extort money from him.
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To apply chum to water as bait.
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(idiomatic, informal) To be friendly toward (with or to) someone, especially in an ingratiating way; to form a friendship (with).
I chummed up with a few of my new work colleagues.
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The vocabulary of software engineers, AI researchers, and anyone living in a terminal or on GitHub — from LLM to MCP, CORS to vibe coding, agentic to enshittification.
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