Yoko-Otoshi is a sacrifice throw (sutemi-waza), and as its name suggests the direction of the throw is to the side (Yoko). You must use your hands to direct the technique, and drop down fast with your body (o-toshi) to make this throw work.
How to throw with Yoko-Otoshi
1. Get your partner moving off balance to the side.
2. Drop down, sticking your leg out to block uke’s sideways movement.
3. Direct the throw using your hands to steer your partner onto their back.