As a verb, to blow means, in its most common definition, is for air to move either by nature (e.g., the wind or a breeze) or for a person to push air out of his or her mouth. To blow past something is to move quickly beyond it. The past tense is blew an the past participle is blown (e.g., I have blown a tire.). While dictionaries will say that blowed is a past tense form of blow, however, most readers will see this as incorrect. In some slang blowed is used to mean an event was awful, but even then it is more correct to say ‘it blew‘.
There are many compound verbs which use blow including: blow up, blow out, blow hot, blow smoke, blow off steam, blow a gasket, and others.
As a noun, a blow is a hit or something which causes injury.