Definition of shoulder harness in US English:

noun

• 1A strap worn around or across the shoulder.

  1. 1.1 The part of a seat belt that lies diagonally across the chest.
     Example sentences

     • ‘Wear your seat belt and shoulder harness when riding in a car.’
     • ‘Will we now look more at shoulder harnesses and double check seat belts?’
     • ‘In the cockpit, which lacked shoulder harnesses, Tribe and Trucker's seat belts dug into their stomachs.’
     • ‘That means wearing seat belts and shoulder harnesses properly, and ensuring our children are safely seated in child seats that are installed correctly in any vehicle.’
     • ‘He was wearing a seat belt and a shoulder harness at the time of the rollover.’
  2. 1.2 A strap worn around the shoulder and under one arm with a holster for carrying a firearm.