The term 'inform against' can be defined as to give information to someone in authority about a person's wrongdoings. The crossword solutions for this term are 'DENOUNCE' (8 letters), 'raton' (5 letters), 'ratout' (6 letters) and 'tellon' (6 letters). All of these words have similar meanings, with 'DENOUNCE' being the most formal and 'tellon' being the least formal. 'Raton' and 'ratout' are slang terms that mean to inform on someone.