Tomoe-nage (巴投), the circle throw.

Nage-waza (throwing techniques), Ma-sutemi-waza (rear sacrifice techniques), Gokyo 3rd set (Dai-sankyo).
Required for: 14th Mon (blue belt, British Judo Association); 2nd Kyu (blue belt, JudoScotland); 1st Dan (black belt, British Judo Association); 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).
Also known as: overhead sweep (bjj) - From guard, BJJ calls the same mechanics the overhead or balloon sweep..

About
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The classic sacrifice throw: tori drops beneath uke, places a foot on the abdomen, and throws uke overhead in a full circle.

Step by step (standard right-handed form)
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1. From a right-handed grip, push your partner so they push back into you: the throw uses their forward pressure.
2. Step your left foot deep between their feet and sit down close to your own left heel, folding underneath them as they press forward.
3. As you sit, place the sole of your right foot against their body at the belt line, low on the abdomen, knee bent between you.
4. Roll onto your back, pulling both hands over your head in a smooth arc; your bent leg extends as they pass over you.
5. They sail over your head in a full circle and land on their back beyond you. Keep pulling through the whole arc so the rotation is complete, then release cleanly.

Key points
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1. Sit close under uke, foot planted below the belt
2. Pull uke over you: the arms steer the circle
3. Roll back on your spine, not flat onto your back

Receiving it
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Your partner drops away beneath you and a foot arrives at your belt line: their sitting weight pulls you forward and the foot sends you overhead. You fly further than you expect. Stay round, keep your chin tucked, and go with the full circle; you land on your back well beyond them, and a good roll out of it is safer than fighting the arc.

VI judo notes
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The throw runs on their forward pressure, which reaches you through the grips before anything else moves, so the gripped-up start suits it well. Place your foot on the belt line by sliding it up their body rather than kicking to a height. Know where the mat edge is before you sit down, and keep pulling through the whole arc so they land rolling.

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

From Waza Book: https://wazabook.com/techniques/tomoe-nage/