Is it better to use logic than a dictionary in English

Not that Microsoft's been perfect on the ethics front lately. Last summer, the company decided to keep doing business in China and obey local censorship laws, even as Google threatened to vacate the country. (Google eventually went crawling back.)

"Google threatened to vacate the country." I believe this means that Google threatened to stop having business in China not to leave China, am I correct?

According to dictionaries, it means to leave a place, exit a place or to leave a job or a position. Does dictionaries miss some explanations? Also, the verb Deem mean to think about something or someone in a particular way, but in a sentence like..We deemed it wise to wait..deem here means believe.

Do you think it's better to use logic than a strict explanation?

Last thing, I used "strict" here and I meant by it an explanation that cannot be changed or flexible, can be interpreted differently, although it doesn't have this meaning in the dictionary, but I think you got the meaning of it or what I meant.

Note: I don't know if it was, strict, appropriate to use in this situation. Hope this is not so-called English and I'm confusing things.

Thanks.