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live rent-free in someone's head

(chiefly, US, informal, idiomatic) To be the perpetual focus of someone's thoughts, with that person having no control over this situation.

Documented since 1910s1910sSilenthistorical132 viewsLast reviewed Jun 29, 2026+ Add a definition
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Born ~1918 · no dated citations yet
1918BornToday, 2026

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#1·Apr 27, 2026

(chiefly, US, informal, idiomatic) To be the perpetual focus of someone's thoughts, with that person having no control over this situation.

Origin: Often attributed to American advice columnist Eppie Lederer (1918–2002), who used it in her syndicated advice column in 1990. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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