To lie down with a woman (اسْتِفْراشٌ)
أصول الفقه
المعنى الاصطلاحي :
Having sexual intercourse with a woman, whether she is a wife or a slave woman.
التعريف اللغوي المختصر :
"Istifrāsh": bedding; taking something as a "firāsh", a mattress, bed or so to sit or sleep on; having sexual intercourse with a woman.