大肆宣传[尤指书或电影]; 为…大做广告；If someone plugs a commercial product, especially a book or a film, they praise it in order to encourage people to buy it or see it because they have an interest in it doing well.
We did not want people on the show who are purely interested in plugging a book or film.
我们不想让那些只想为书或电影做广告的人上节目。
Plug is also a noun.
Let’s do this show tonight and it’ll be a great plug, a great promotion.
我们今晚做这个节目吧，它会是一次很好的宣传、有力的推介。