Nagashi uke
Nagashi uke (literally: “sweeping-hand block”), the sweeping block is not a block per se; it allows a karateka to exchange their chance to block for a speed bonus on their outside 7-3. Since sweeping block compromises the defense-in-depth that comes from combining blocks with evasions, they are reserved for advanced students, who should have highly reliable evasion skills.
Enter a same-side front or fighting stance, and extend your same-side arm in front of you, parallel to the floor. Hook your hand behind your opponent’s same-side shoulder, then 7-3 to the outside, while simultaneously pulling your hand to your opposite-side shoulder.
[video of sweeping hand block in the air from the front and the side, fast and slow.]
As you step past your opponent to the outside, you will simultaneously pull your opponent to the inside, augmenting your 7-3 in all regards.
This is a dynamic move, which makes little sense to practice alone in the air. It is best to practice this with a live partner; if one is unavailable, practice on trees, posts, columns, etc.
[sweeping hand block from the front and the side, fast and slow, against a partner and against a post]