The crossword solution for the term 'TO ___ WITH LOVE' is SIR, which is a three-letter word. SIR is an honorific title used in many countries, especially in the United Kingdom, to address a man who has been knighted by the monarch. It is also used as a form of address for certain officials, such as judges and mayors. The phrase 'To SIR With Love' is the title of a 1967 British drama film starring Sidney Poitier, which tells the story of a teacher's struggles to reach out to a group of problem students in a tough East End school in London.