Idiom Magic : TWO'S COMPANY, THREE'S A CROWD 兩人成伴,三人不歡

【明報專訊】Bob and Fiona want to be alone but little Willy will not leave the room. He's an absolute nuisance (討厭的人) because he doesn't seem to understand that when two lovers want to be alone two's company, three's a crowd. For Willy's information, the statement means that Bob and Fiona have each other for company (作伴) — and a third person is an unwelcome intrusion (騷擾).