What does "get along like a house on fire" mean?
1. Definition (expr.) get along well; become good friends
Examples My sister and I never fight. We get along like a house on fire.
Examples Sandra and George get along like a house on fire now, but they hated each other when they first met.
Examples Ever since they were little kids, Mandy and Charles got along like a house on fire, so it’s not surprising that now they’re getting married.