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bidie-in

British  
/ ˌbaɪdɪˈɪn /

noun

  1. a live-in sexual partner

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The public appeal also yielded a host of Scots terms, from “bidie-in”, which the OED defines as “a person who lives with his or her partner in a non-marital relationship”, and which it says was first recorded in 1916, to “bigsie”.

From The Guardian

By contrast, Karen’s relationship with her “bidie-in” — a fellow cop who lives with her, ruffles her hair and runs baths for her — feels tepid.

From Washington Post