Uke is the attacker. The word literally means „the receiving one“.

Ukemi is the reaction of uke to a technique, especially in the sense of rolling or falling. The word literally means "receiving".

Entry in the back of uke at the beginning of a technique.

Rolling or falling backwards.

Generic name for all attacks from behind. Uke steps into the back of tori, e.g. in order to choke him from behind.