O soto otoshi video
Info about "O soto otoshi video"
O soto otoshi (major outer drop) is one of the preserved throwing techniques, Habukareta Waza, of Judo. It belonged to the fourth group, Yonkyo, of the 1895 Gokyo no Waza lists. It is categorized as a foot technique, ashi waza. 
Very much like o soto gari, o soto otoshi is more of a block-and-trip than the afore-mentioned technique. As with o soto gari, step forward with your closest leg pushed in between the uke’s legs and the hands forcing the uke to the floor. This technique has been included into the newer Kodokan syllabus to differentiate the poor technique usually employed by beginners for o soto gari. 
Fro Wikipedia  and akitasjudo.com