sätta fast betyder på engelska

attach [attached, attaching, attaches]▼(to fasten, to join to)
verb
[UK: ə.ˈtætʃ] [US: ə.ˈtætʃ]

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