The term 'conspire AGAINST' can be broken down into two crossword solutions: 'PLOT' (4 letters) and 'AGAINST' (7 letters). PLOT is a verb meaning to devise or contrive a plan or scheme, usually with the intention of doing something unlawful or harmful. AGAINST is a preposition meaning in opposition to or in resistance to. Therefore, when combined, the term 'conspire AGAINST' means to devise a plan or scheme in opposition to or in resistance to someone or something.