第一教 · Dai Ikkyo
O Goshi 大腰
Major Hip Throw
Mechanic
Tori drops his hips below uke's center, wraps an arm around the waist, lifts uke onto his hips, and tips forward. Uke's body rolls over the hip like a load over an edge and lands in front.
Analogy
A gardener wheels a friend along in a wheelbarrow, then lifts the handles high. The passenger pivots over the front lip and rolls out onto the grass in a heap while the barrow tips over its front wheel.
Why it maps
Lifting from behind rotates the whole load over a low fixed edge at hip height, exactly how tori's raised hips become the tipping point uke rolls over.