In the third stanza of part 1 of the poem, the highwayman and his horse approach the inn where the landlord's daughter lives. The sound of the horse's hooves approaching the inn over the cobblestone ground is described onomatopoeically: "Over the cobbles he clattered and clashed." The words clattered and clashed onomatopoeically echo the sound of the horse's hooves against the ground.
In part 2 of the poem, in stanzas 6 and 7, the landlord's daughter hears the highwayman's horse in the distance, indicating that he is riding back to her. The sound that the landlord's daughter hears is "Tlot-tlot; tlot-tlot." This is a softer, lighter sound than the earlier onomatopoeia of "clattered" and "clashed," indicating that the highwayman and his horse are, at this point in the poem, much further away.