泛泛之交fàn fàn zhī jiāo

a casual (/nodding/speaking) acquaintance;on speaking (/nodding)terms
❍ 参加了星二聚餐会以后，认识了一些人，也不过～，谈不上往来，更提不到友谊。(周而复《上海的早晨》Ⅰ—476) He had,it is true,got to know a number of people since he had been a member of the Tuesday Dining Club,but these were only nodding acquain tances and were far from being regular contacts,and even farther from being friends.

• ohio
• ohm
• oil
• oilfield
• ok
• okay
• oklahoma
• old
• olive
• oliver
• olympic
• olympics
• omelette
• omit
• on
• once
• one
• oneself
• ongoing
• onion
• only
• ontario
• onto
• opaque
• open