something to accelerate one's death/someone who keeps asking other to hurry up/a powerful and devastating stance or measures taken on one
Definitions (粵典–words.hk)
名詞
民間信仰中可以催人早死嘅符咒；後泛指加速或導致死亡嘅嘢（量詞：道） something that hastens one's death (literally: a written Taoistic spell which is supposed to hasten a person's death)
名詞
比喻不斷催促其他人做嘢嘅人 a person who is always pressing others to complete something or do something
Definitions (Wiktionary)
noun, literally
a talisman that accelerates one's death
noun, broadly
final nail in the coffin; an irresistible factor that accelerates something's happening