spänna fast znamená v Angličtina

fasten [fastened, fastening, fastens]▼(to attach or connect in a secure manner)
verb
[UK: ˈfɑːs.n̩] [US: ˈfæs.n̩]

buckle up▼(to fasten one's seat belt or safety belt)
verb
[UK: ˈbʌk.l̩ ʌp] [US: ˈbʌk.l̩ ʌp]