volitional + negative verb special meaning or kimarimonku


I was reading a Japanese manga and came across the sentence: よそうかんがえるな。。。

Now, I took this to mean "Stop, let's not think about it", but I am wondering
if the phrase is a set-phrase or it is similar to volitional+omou which means
to plan.

Please let me know, because it is really bothering me.




This is surely 予想を考えるな with を omitted, meaning, "Don't speculate".

[予想を考える](https://www.google.co.jp/search?q=%22%E4%BA%88%E6%83%B3%E3%82%92%E8%80%83%E3%81%88%E3%82%8B%22)
seems to be commonly used in relation to speculation about things like horse
racing, as in e.g. 競馬の予想を考える.




All I can say for sure is that:

> 「よそうかんがえるな」

is **_not_** a set phrase. It is not even normal writing.

If it were meant to be:

> 「よそう、[考]{かんが}えるな・・・」 or even 「よそう、かんがえるな・・・」 in all kana,

then, it would be much better writing and it makes perfect sense as well. It
would mean something like:

> "Nah, let's not! Don't (even) think about it!"

That is, however, still not a set phrase.

