Significado de Blow up
Resposta mais votada
It´s ampliar "to enlarge (the picture here)" or "zoom in" (aumentar o zoom/dar um zomm [aproximando para ver detalhes mais de perto]).
https://www.yourdictionary.com/blow-upA higher image resolution means that the photos taken with the camcorder will be more detailed and sharper, and you'll be able to pick out smaller detailed far better. They will also far more suited to being enlarged, and can be blown up to larger sizes without blurring or losing detail.