Harai-tsurikomi-ashi (払釣込足), the sweeping drawing ankle throw.

Nage-waza (throwing techniques), Ashi-waza (foot and leg techniques), Gokyo 3rd set (Dai-sankyo).
Required for: 4th Dan (black belt, British Judo Association); 5th Dan (black belt, British Judo Association).

About
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Tori draws uke up and forward with the hands and sweeps the advancing ankle away, so uke pivots over the swept foot.

Step by step (standard right-handed form)
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1. From a right-handed grip, step backwards, drawing your partner after you so they step towards you with their right foot.
2. As they step, lift and pull with both hands, the lapel hand rising, so their weight is drawn up and forward onto the advancing foot before it can settle.
3. Sweep that advancing right ankle sideways with the sole of your left foot, catching it before the weight lands fully.
4. Continue turning your hands and trunk to your left as the foot is carried away, so their floating body rotates forward.
5. They turn over the swept ankle and land on their back in front of you; hold the sleeve firmly as they fall.

Key points
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1. Lift-pull upward with the hands as you sweep
2. Sweep the ankle before the foot settles
3. Step back to draw uke onto the sweeping line

Receiving it
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You are drawn up and forward onto a stepping foot, and that ankle is swept sideways out from under the lift: your body floats for a beat and then rotates. It feels like the floor was pulled away mid-stride. Ride the float, tuck your chin, and land on your back with your free arm slapping.

VI judo notes
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The whole set-up is a conversation through the hands: you step back, they step after you, and the lift you feel in the lapel hand tells you the advancing foot has not yet taken weight. Sweep by drawing your sole along the mat into the ankle rather than lifting your foot to meet it, so the foot is found by contact and arrives already moving.

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

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