変化
Henka is a
side-stepping motion in
sumo. Loosely translated it means "to make an unexpected change", and the move can often be seen right at
tachiai (the initial rush at the beginning of a sumo bout): one of the wrestlers may "do a henka" and slap his opponent to the ground with eg. a
hatakikomi (one of 82
kimarite or sumo winning
techniques).
A sumotori (sumo wrestler) can use the move to evade his attacker at any given time during a bout, but the henka is probably most closely associated with a spectacular win.
My sources are http: www.csse.monash.edu.au/cgi-bin/cgiwrap/jwb/j-e/dict - and lots and lots of sumo on TV.