Downswing: Down means down
Downswing starts with a shift of the hips towards the target, tilting the spine slightly back as the right shoulder has exterior rotation causing the right elbow to move in towards the body. Right elbow drops vertically down to the right hip.
The left leg braces in as the right knee moves towards the ball. The the right leg pushs against the ground opening the hips open.
Ground pressure the body is rooted into the ground as feet and legs push against the ground.