Meaning 1 ►▼
In American football, the defensive team adds extra men to rush the quarterback. A blitz is an all-out attack. The term may have been used first by the military for offensive attacks.
The Cowboys used the blitz to get to the quarterback of the Green Bay Packers. The defensive line blitzed the quarterback.
Meaning 2 ►▼
Usually, used offensively as an all-out attack, but can be used defensively as in football.
The Nazi Blitzgreig, a combination of light armour and men in World War II, was a "blitz" as it rolled over the lowland countries at the beginning of the war. It blitzed The Netherlands and Belgium.
The derivation is used in the sentence above. It was a German military offensive in WWII.