1.knife blade2.crucial point
1.lit. (bamboo) splits when it meets the knife's edge (idiom)2.fig. easily solved
handling a butcher's cleaver with ease (idiom); to do sth skillfully and easily
double-edged sword (lit. and fig.)
to kill with one's own hand
to edge a knife, scissor, sword etc
lit. no blood on the men's swords (idiom); fig. an effortless victory