= causative action by which humans use an iron tool to cause an object to have a thin cutting edge, in order to make it useful and effective as a tool; often associated with aggression and danger
to sharpen
Ferocious
= state in which animals are inclined to violent and dangerous activity as dangerous as a sharp knife
to be fierce, to be dangerous
Know
literally: to sharpen someone's face; hence: = causative action by which humans increase the ability of others to assess different situations and react in an effective way