The term 'Hammer and Anvil' is a metaphor used to describe a situation in which two opposing forces are working together to achieve a common goal. The crossword solution for this term is 'BONES', which refers to the BONES of the hammer and anvil, which are used to create a strong and durable structure. This metaphor is often used to describe a situation in which two people or groups are working together to achieve a common goal, despite their differences.