chummy people are friendly with each other, especially in a way that stops other people from joining the group 亲密无间的;非常友好的 get chummy with someone (=become very friendly with someone) 和某人很亲密 : I can't see him getting chummy with Bill – they have absolutely nothing in common. 我看不出他和比尔有多亲密,他们俩绝对没有任何共同之处。
Synonyms and related words