noun
crowd-puller; box-office certainty
Used in entertainment contexts to describe a performer, work, or event that reliably attracts a large audience or guarantees ticket sales.
彼の新作映画は独参湯になるだろう。
His new movie will be a box-office certainty.
あの歌手はテレビ局にとって独参湯だ。
That singer is a crowd-puller for TV stations.