You'd think that the word delebrity would just be the longer version of deleb, but that doesn't seem to be the case.

你可能会以为delebrity是deleb的加长版形式，但其实不是的。

youdao

This is part of what lies behind a slang term of the marketing and entertainment business that has recently started to appear in media addressed to the wider world: deleb, short for "dead celebrity".

这就是最近市场营销和娱乐业中一个俚语开始在媒体中广泛出现的部分原因，这个词就是deleb，“已故名人”英文表达的缩写。

youdao