A switch attachment is a device that is used to connect two or more electrical circuits together. The two crossword solutions for this term are 'BLADE' and 'eroo'. BLADE is a five-letter word that refers to the flat, thin metal part of the switch attachment, while eroo is a four-letter word that refers to the curved metal part of the switch attachment. Together, these two parts form the switch attachment, which is used to connect two or more electrical circuits.