Harai-makikomi (払巻込), the sweeping wraparound.

Nage-waza (throwing techniques), Yoko-sutemi-waza (side sacrifice techniques).
Required for: 2nd Dan (black belt, British Judo Association); 3rd Dan (black belt, British Judo Association); 4th Dan (black belt, British Judo Association); 5th Dan (black belt, British Judo Association).

About
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The sweeping hip throw finished as a winding sacrifice: when harai-goshi is resisted, tori releases the lapel, wraps uke's arm, and rotates to the mat with the sweep still working, carrying uke over.

Step by step (standard right-handed form)
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1. Attack with the sweeping hip throw from a right-handed grip: back turned in, right leg sweeping along the outside of their right thigh.
2. As they resist, release your lapel grip and throw your right arm up and over their right arm and shoulder, wrapping it tight against your body.
3. Commit your body into rotation towards the mat, the sweeping leg still rising as you wind.
4. You travel to the mat together as one turning unit, your side taking the landing.
5. They roll over and past you and land on their back beyond; release the wrapped arm the moment they land.

Key points
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1. Enter as an honest harai-goshi; the wrap answers their defence
2. Trap the arm and wind your whole body as one unit
3. Land rolling on your side with them wrapped, never flat beneath them

Receiving it
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The harai-goshi you were defending suddenly wraps your arm and commits: their whole body weight joins the throw and you rotate together. Your wrapped right side cannot slap, so curl with the rotation, chin tucked, and let your side and back arrive together beside them. Build this one up gradually; wrapped falls are heavy.

Reference pages elsewhere
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Harai-maki-komi on the IJF technique reference (International Judo Federation): https://judo.ijf.org/techniques/Harai-makikomi

From Waza Book: https://wazabook.com/techniques/harai-makikomi/