A pawn storm, sometimes called a pawn avalanche, is a chess tactic in which several pawns are moved in rapid succession toward the opponent’s defenses. […] One can launch a pawn storm for many reasons. Probably the most common of these is to initiate a mating attack.
One pawn - Look at him. Puny and ineffectual. Pffft.
A pawn storm directed at your king. Look at them! Menacing and the attack could be deadly!