Idioms about relationshipsOnline version Put each idiom in the correct category. by Lina Ramírez 1 Positive idioms 2 Negative idioms Get on like a house on fire: "They get on like a house on fire.” Go back a long way: “Those two go back a long way. They were at primary school together.” Be in with: “She’s in with the management.” Keep someone at arm’s length: "“I'd rather keep her at arm’s length for now.” Sworn enemies: "Those two are sworn enemies." Get off on the wrong foot with someone: “She really got off on the wrong foot with her new boss.”