This is the 4979th most frequent Polish word.
pokaza
It seems there might be a small error in the word you provided—there isn't a Polish word "pokaza" by itself. However, "pokazać" means "to show" or "to demonstrate" in English.
Here 'pokaże' is a verb meaning 'will show', used to indicate that the person will present or exhibit something.
Ona pokaże swoje malowanie na wystawie.
She will show her painting at the exhibition.
In this sentence, 'pokazałem' is the past tense form of the verb, meaning 'I showed', specifically 'to demonstrate' visually or with explanation.
Pokazałem mu drogę na mapie.
I showed him the way on the map.
Here, 'pokazać' is used in its infinitive form, meaning 'to show', employed to request assistance or demonstration.