Gyaku-ude-kujiki
(straight armlock from beneath opponent)
"As Uke reaches forward grasp his
wrist, and pull it to your shoulder. At the same time bring
up your right leg and plant the sole of your foot firmly into
Uke's left thigh. Straighten your leg and push his thigh from
under him. 
The
opposing pull on his arm and the thrust of his thigh will bring
him full length to the mat. As he falls, roll over to your right
and swing your out-stretched left leg over his upper right arm.
If possible anchoring it under Uke's head or neck. Apply the
lock by bearing down on his arm with your leg and lifting with
your hands."
