What does the word footprint mean?

Usage examples for footprint

  1. It was only by a supreme effort that he mastered his overwhelming need of some physical outlet for the passion of disgust and anger which swept him bare of any gentler emotion as the incoming tide sweeps the shore bare of sign or footprint. – The Vision of Desire by Margaret Pedler
  2. Andrew examined the footprint. – Johnstone of the Border by Harold Bindloss
  3. It went right up through River Lane where there isn't any pavement and every footprint was plain. – Roy Blakeley by Percy Keese Fitzhugh