ghostwrite
verb [ T ] /ˈɡəʊst.raɪt/ /ˈɡoʊst.raɪt/ (also ghost)
为…代笔，给…做枪手，替…当捉刀人
to write a book or article, etc. for another person, so that that person can pretend it is his or her own or use it himself or herself
His autobiography was ghostwritten. 他的自传是别人代写的。