trattenere il fiato significa in inglese

gasp [gasped, gasping, gasps]▼(to draw in the breath suddenly)
verb
[UK: ɡɑːsp] [US: ˈɡæsp]

hold one's breath▼(to hold one's breath)
verb
[UK: həʊld wʌnz breθ] [US: hoʊld wʌnz ˈbreθ]