To reposition something such as a product or service means to try to interest more or different people in it, for example by changing certain things about it or the way it is marketed.
例句
The sell-off is aimed at repositioning the company as a publisher principally of business information...出售公司部分业务的目的是将公司重新定位为以商业信息类出版物为主的出版商。Mazda needs to reposition itself if it is to boost its sales and reputation.要想提升销量和声誉，马自达公司需要对自己重新定位。