Ah, the business of translation has a "catch" (uma pegadinha), the context related to it.

   I mean, when I learn that "eons"  means a long time somebody might come and say "... and they looked as if they hadn´t moved in yonks."       So, eons might be outdated already...depending on the audience.

    Or when I learn that somebody pretendind, making something up, I read this piece of text in the novel ON OFF: 

    "Ever since word got round about my police guard, I´m regarded differently. Most of them think I´m putting it on"  

    "putting it on?"

    "Making it up"

      Of course, it is a novel and the language is informal in style but it serves the purpose of showing you that context is everything, all is not what it seems!   Or don´t seem like nothing you have seen or recall.   

      Hence the importance of reference material, like business dictionaries, medical knowledge and in-the-know people, encyclopedias etc...