What is the meaning of Broadside?

One side of a ship above the water line; all the guns on one side of a warship; their simultaneous firing.

A forceful attack, whether written or spoken.

A large sheet of paper, printed on one side and folded.

The printed lyrics of a folk song or ballad; a broadsheet.

Sideways; with the side turned to the direction of some object.

To collide with something side-on.

Source: wiktionary.org