On the tip of one's tongue" is an idiom that describes the situation when you think you know something and are ready to utter it but unable to do it at the moment.

To see the world means comprehending what we see; for this, we use a language system. Verbal constructions act as a means of systematization of the world. What comes instead of utterance where there is no language? Wandering in uncertainty, in this ambivalent zone, you cannot find an answer, and you cannot form a query as well. Uncertainty is used by the authorities as a tool of control and as a deforming narrative. This narrative is constructed through the generation of events — authentic or fictitious, past or present, physical or imaginary.