blitz [countable usually singular]
a sudden military attack, especially from the air
the Blitz (=the bombing of British cities by German aircraft in 1940 and 1941)
a period of great effort in order to deal with something quickly and completely
We'll have to have a blitz on the house before your parents arrive.
a big effort to make people notice something or buy something
a media/marketing/advertising etc blitz
The campaign was launched with a nationwide publicity blitz.
—blitz verb [transitive]
News came that Rotterdam had been blitzed.