n. step, footstep; sound of a footstep

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Noun
1. the sound of a step of someone walking; "he heard footsteps on the porch"
(synonym) footstep, step
(hypernym) sound
(hyponym) tramp

the number of people that walk past/enter a shop; obviously affects potential sales; analageous to 'bums on seats' in the entertainment business or 'bums on beds' in the hotel business.