Definition of sleep together phrasal verb from the Oxford Advanced American Dictionary

 

sleep together

 phrasal verb
phrasal verb
 
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Phrasal Verbs

sleep together

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sleep with somebody

(informal)
 
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to have sex with someone, especially someone you are not married to I know he's going out with her, but I don't think they're sleeping together. Everyone knows she sleeps with the boss.
See the Oxford Advanced Learner's Dictionary entry: sleep together