Morote-gari (双手刈), the two-hand reap.

Nage-waza (throwing techniques), Te-waza (hand techniques).
Required for: 15th Mon (blue belt, British Judo Association); 5th Dan (black belt, British Judo Association).
Also known as: double leg takedown (wrestling); double leg (bjj).

About
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The two-handed leg reap: tori drops under the grips, wraps both hands behind uke's knees and drives through with the shoulder, taking both legs away. A Kodokan-recognised te-waza and a staple of wrestling and BJJ, it is prohibited in current IJF competition under the leg-grab rules, but remains legal to practise, appears in older and junior syllabuses, and is essential to recognise and defend.

Step by step (standard right-handed form)
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1. From your own grips or as your partner reaches, bend both knees sharply so your head comes below their chest; keep your back straight.
2. Step your right foot between their feet and drive forward, placing your right shoulder against their stomach or chest.
3. Wrap both hands behind their knees, one behind each, palms pulling towards you.
4. Drive forward and up with your legs while your hands pull their knees past your hips.
5. Their legs come away and they fall onto their back; keep your head up and to the side, and lower them under control rather than spiking them.
6. Note for competition: this technique is banned in current IJF contest rules; practise it for grading, ne-waza entries and defence.

Key points
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1. Change levels first: bend the knees, not the back
2. Both hands behind the knees, shoulder tight to the body
3. Drive through with the legs; pull the knees towards you

Receiving it
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The warning is your partner's level dropping suddenly: their head leaves your upper zone and a shoulder plants into your middle, then both your knees are pulled forward while the shoulder keeps driving. Both legs go at once, so the fall is flat onto the back with little time to step out. Neither arm is held, so slap with both, chin tucked hard because the drive can carry you quickly. In practice, agree the pace first; taken gently it is a soft, flat landing.

VI judo notes
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VI judo contests start gripped up, which removes the shooting entry this throw is best known for; from contact it becomes a level-change you feel through the grips as your partner's arms drop away. Defending it is mostly tactile: the instant the head drops and a shoulder touches your middle, sprawl your hips back and take the head.

Reference pages elsewhere
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Morote-gari on the IJF technique reference (International Judo Federation): https://judo.ijf.org/techniques/Morote-gari

From Waza Book: https://wazabook.com/techniques/morote-gari/