punto di non ritorno significa in inglese

point of no return▼((aviation) the point in a flight when there is insufficient fuel to return to the origin)
noun
[UK: pɔɪnt əv nəʊ rɪ.ˈtɜːn] [US: ˈpɔɪnt əv ˈnoʊ rə.ˈtɝːn]