(business) poison pill

one who sets fire / (by extension) one responsible for something's popularity, etc.

(linguistics) "role language": unique language usage serving as a marker of social identity in fictional speech

executive officer

If one learns without thinking, one will be lost in his learning. That is, if one does not think about what one learns, he will not arrive at the truth of it.

to go / to carry out / line, row

unlucky / misfortune / bad luck / disaster

signature / government office / police station

elixir of life

pharmacotherapy (use of pharmaceuticals to treat disease)