The crossword solution for the term 'in the back (betrays)' is 'STABS'. This term is often used to describe a situation in which someone betrays another person by attacking them from behind. It can also be used to describe a situation in which someone is betrayed by someone they trusted. In either case, the act of betrayal is usually done with a sharp object such as a knife or sword, hence the use of the word 'stabs'.