"Hype up" is a colloquial phrase used to convey excitement, enthusiasm, and promotion. It is often used in the context of marketing and advertising to generate interest in a product or event. However, there are several synonyms in English that can be used to convey the same meaning. Some of the most popular synonyms for "hype up" include promote, advertise, market, boost, publicize, and hype. Other synonyms include fuel, stimulate, build up, excite, and drum up. Depending on the context, these synonyms can be used interchangeably to convey the same meaning as "hype up".