There are two kinds of slips: a side slip and a forward slip. Drop one wing and apply opposite rudder to induce a forward slip and lose altitude quickly.
Aircraft Slip To Lose Altitude: Technique
Forward & Side Slips Private Pilot Online Ground School
1 The aircraft forces in straight, level, un-accelerated flight.
Forward Slip to Landing Tutorial
AUPRTA Rev3 - Tablet
Forward Slip to Land, Losing Altitude with a Slip
How to slip an airplane - Sporty's Advanced Pilot Skills Series with Spencer Suderman (episode 5)
Anatomy of a slip - AOPA
Ep. 26: How to Forward Slip an Airplane
How to Sideslip Smoothly
Forward Slip to Landing - MzeroA Flight Training
Sideways - AOPA
approach - Mushing glide vs forward slip sink rate - Aviation Stack Exchange
Risk - The Top Rudder Remedy - Plane & Pilot Magazine
High On Final? Here's How To Use A Forward Slip To Correct