This is the 16286th most frequent Turkish word.
yapmamamız
"Yapmamamız" means "our not doing (something)" in English.
Here, 'yapmamamız' means 'what we should not do', functioning as a nominalized verb used to describe actions in general.
Her zaman yapmamamız gereken şeyleri dikkatle takip etmeliyiz.
We should always carefully follow the things we ought not to do.
In this sentence, 'yapmamamız' denotes 'what we should avoid doing in this situation' and focuses on prohibitive advice.
Bu durumda yapmamamız gereken şey diğer kişiyi suçlamak olacaktır.
In this situation, the thing we should not do would be blaming the other person.
This usage of 'yapmamamız' allows expressing the importance of awareness regarding actions to avoid.