Answer (1 of 6): I know that 告げ口 (tsugeguchi) means someone who has a habit of telling on others. A snitch, in slang terms. 告げ口をする (tsugeguchi wo suru) means “to do the snitch thing”, or to tell a secret to someone else. As for “spilling the beans”, the closest to that is うっかり秘密を漏らす (Ukkari himit
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