A Big Blow to Pewton

Big is a word expression. It basically means an event that has a large and sort of devastating effect. Blow often refers to the act of blowing with air, like sighing and blowing. Another way in which we use blow that will reinforce this idea is in something like fighting. So when somebody blows air at you, it hits you, and it makes an impact. We use that idea of blow for impact, specially related to punch and punches and air.