Robert Moore wrote in
2.60:

Stealth Pilot wrote
Sideslips are a very useful tool because they allow you to
substantially increase the drag, which makes you descent like a
plumbers toolbag, but doesnt change the forward speed. so you have no
increased risk of stalling as you wash off the height.

What you have described is the "forward slip". Although control usage
is the same in both, a "side slip" is used to correct for a crosswind,
and a "forward slip" is used to descend more rapidly on final without
having the airspeed increase. If one is not landing, I suppose that it
would just be a "slip".

Airliners normally do not use either because of the increased discomfort
caused the passengers....both being uncoordinated flight.

Actually, they do. The 72 and 70 were kind of excepetions because of the
risk of dragging a flap or pod, but most jet airliners land better in
crosswinds when slipped.
Even the autopilot will slip it if you're doing an autoland



Bertie