The term 'Big Hammer' is a colloquialism used to describe a tool that is used for heavy-duty pounding or smashing. The three crossword solutions for this term are MALLET (6 letters), SLEDGE (6 letters), and MAUL (4 letters). A MALLET is a hammer with a large head and a short handle, usually made of wood. A sledgehammer is a heavy hammer with a long handle, typically used for demolition work. A MAUL is a heavy hammer with a long handle and a wedge-shaped head, used for splitting wood.