German "wieder" which can mean "against"

Actually, that's "wider", and it also surfaces in "withstand". Anglo-Saxon was "wið". As regards the "shins" part, that's explained in the dictionary along with the rest. It means "sense" or "direction", which I guess looks weird to English speakers, but in German, "clockwise" is "Uhrzeigersinn" ("in the direction of the clockpointers" or hands).