trail
/tɹeɪl/
The track or indication marking the route followed by something that has passed, such as the footprints of animal on land or the contrail of an airplane in the sky.
A route for travel over land, especially a narrow, unpaved pathway for use by hikers, horseback riders, etc.
A trailer broadcast on television for a forthcoming film or programme.
A walk in which all the edges are distinct.