The crossword solution for the term 'BACK AND ___' is 'FORTH' (5 letters). The phrase 'back and FORTH' is an idiom that means to move or travel between two places repeatedly. It can also be used to describe a discussion or debate that goes back and FORTH between two people. This phrase is often used to describe a situation in which two people are arguing or debating, but neither one is able to come to a resolution.