a 'one-way' [=('Brit') 'single'] ticket/fare/trip
a 'one-way' [='one-sided'] conversation
This street is just 'one-way'.
(..) It's a long way off, But scientists are already speculating About a mission to a black hole... A one-way trip to the most dangerous place in the universe. Dr. Kaku: Originally, Physicists were horrified at the idea of black holes. (..)2010 TvShow: How the Universe Works Title: Black Holes Season: 1 Episode 2