clop-clop

He marches up and down, beating two pieces of wood together--clop-clop, clop-clop--as he walks.

Suddenly the girls were startled to hear the sharp, ringing clop-clop of steel-shod hoofs.

Distinctly, both girls could hear the clop-clop of approaching hoofbeats.

There was the jangle of harness and bells; the clop-clop of hoofs, rising to a clatter.

The creak of saddle leather and the clop clop of her horses hoofs were all the sounds that disturbed the stillness.