A large flat surface, finished with black slate or a similar material, that can be written upon with chalk and subsequently erased; a chalkboard.
To use a blackboard to assist in an informal discussion.
A large sheet of paper, printed on one side and folded.
The printed lyrics of a folk song or ballad; a broadsheet.
A forceful attack, be it written or spoken.
One side of a ship above the water line; all the guns on one side of a warship; their simultaneous firing.
Sideways; with the side turned to the direction of some object.
To collide with something side-on.