a 'one-way' [=('Brit') 'single'] ticket/fare/trip
a 'one-way' [='one-sided'] conversation
This street is just 'one-way'.
(..) And now, I'm here in space. Yeah, right where I didn't want you to be. This isn't Coney Island. This isn't a field trip. This is a one-way ticket. You hear me? Don't pretend you thought this through. No, I did think this through. You could not have possibly thought this through. (..)2018 Avengers: Infinity War