Definition of pass-by in US English:

pass-by

noun

  • 1An act of passing by. rare before late 20th cent.

  • 2A passer-by. rare.

  • 3Mining. A place on a railway where vehicles can pass one another. Now rare.

Origin

Mid 16th century; earliest use found in Thomas Cranmer (1489–1556), archbishop of Canterbury. From pass + by, after to pass by.