/ɪn; ɪn/
(forming compound ns 用以构成复合名词) (becoming dated 渐旧) (added to another word (usu a v) to indicate an activity in which many people participate 附于另一词（通常为动词）後, 表示有很多人参加的活动)
*a `sit-in
* `teach-ins.

A drive-in is a facility such as a bank, restaurant, or movie theater where one can literally drive in with an automobile for service. It is usually distinguished from a drive-through.