Trust between two people is a 'two-way street'. [=trust requires effort from both people]
Communication is a 'two-way' process.
a 'two-way' street
(..) especially when I had to entertain myself because my father was too busy for me. That's how I know that mirror is a two-way. There's a hidden camera in that lamp. And... while a lot of these fixtures have changed-- (..)2016 TvShow: Bones Title: The Fight in the Fixer Season: 11 Episode 15