This is the 17485th most frequent Polish word.
zawale
The word "zawałę" does not exist in Polish. If you meant "zawał", it translates to "heart attack".
In this sentence, 'zawale' is a form of the verb meaning 'will collapse', used in the subjunctive mood to signify a consequence.
Jeżeli nie zaczniemy remontu, zawale się podłoga.
If we don't start the renovation, the floor will collapse.
Here, 'zawale' expresses determination not to fail, deriving from the verb 'zawalać' which means 'to fail' or 'to mess up' informally.
Nie zawale tego egzaminu, jestem dobrze przygotowany.
I won't fail this exam; I'm well-prepared.
In this usage, 'zawale' is part of the phrase 'zawał serca' (heart attack), where it roots from the noun 'zawał' combined in instrumental case for context.