With Tarquin's ravishing strides towards his design
Tarquin was an infamous criminal of early Roman society, known for his raping and murdering of young women. “Ravish” in this sentence therefore translates to “rape” or “violate” to refer to Tarquin’s actions. “His design” is his victim. This makes up more of the wolf metaphor, adding more emphasis to the violation which the “wolf” is conducting. This gives an insight into how profoundly affected Macbeth is by these plans and how he feels that his morality is being “ravished” by them.