Explain the personification "cannons mouth" and its effectiveness in the poem "The seven stages of a man"."The seven stages of a man" by William Shakespeare
I am not sure what there is to explain here.
The "mouth" of a cannon is simply the opening in the front of the cannon where the cannon ball would (in those days) have been put in and where it would come out when fired.
The personification here is probably meant to convey the danger that the man is willing to face in trying to be a hero. When we say that the cannon has a mouth, it sounds like it is going to eat the man. So it sounds very vivid -- he is going to attempt to be a hero even in the mouth of the cannon (by charging right up to the cannons in war).