This is the 14851st most frequent Russian word.
повредит
"Повредит" means "will damage" or "will harm."
Here, 'повредишь' refers to the act of harming oneself physically.
Не трогай это, ты ещё повредишь себя.
Don't touch this, you might hurt yourself.
In this sentence, 'повредить' implies causing harm or damage to eyes due to excessive brightness.
Слишком яркий свет может повредить зрение.
Too bright light can damage eyesight.
Here, 'повредит' indicates the possibility of physical damage to the book.