The term 'set against' can be broken down into three crossword solutions: COMPARE (7 letters), ANTI (4 letters), and PIT (3 letters). COMPARE means to examine or judge in order to note similarities and differences, while ANTI means opposed to or against. Finally, PIT is a noun that refers to a hole, cavity, or depression in a surface. Together, these words create the phrase 'set against, ' which means to oppose or contrast.