Can "bounce" (not "bounce angle") also mean the back of a sand wedge?

okay. it's not the "back" of the club; it's the "back edge" of the bottom or sole of the club. the back of a club is more relative to heel-toe weighting and being cavity-BACKed.

with a shaft vertical, most irons have the back edge of the sole a little lower than the front edge (so, on hard flat surface the club would rest on the back edge). on a hard surface, any club will always bounce. but on softer sand and turf, if not for the bounce angle, the club would dig (as one answer said). so the softer the sand, the more bounce you want. this is the primary reason to spin the clubhead open in a greenside bunker - to increase the effective bounce angle.

gene sarazen invented the sand wedge in 1932. he was flying in a plane and noticed the flaps go down and then the plane rise. so he went about experimenting and making his own sand wedges (and tried keeping them covered and secret for a year or so).

so the bounce angle is similar to the difference from the front edge of a wing, and the bottom edge of a flap. and you can think of the sand as air (or water), and the bounce as flaps down.

this is why some drivers are more tapered toward the back. no need to not dig, and bounce (flaps down) creates wind or ground resistance, which is not desired with a driver that doesn't touch the ground.

p.s. - contrary to the video (more standard bs), the "open stance" (which is also incorrect verbiage/instruction) is just a pre-compensation for having the clubface open (which causes the sand and ball to go to the right. so we align/swing to the left, but no need to change swing motion in relation to body alignment. the swing should not be "out to in"!!!

Bounce is the angle from the leading edge of the sole to the trailing edge–the higher bounce a club has, the less it digs into the ground or sand. Lie is the angle of the shaft in relation to the ground.

To my understanding they mean the same thing