COMB in N-COUNT
(放在两个名词中间构成名词)表示“和”，“与”，“兼”
-cum- is put between two nouns to form a noun referring to something or someone that is partly one thing and partly another.
例句
...a dining-room-cum-study...
餐厅兼书房
She was a sort of policewoman-cum-prosecutor.
她可以说是警察兼检察官。