pitter-patter

My heart kept up its pitter-patter as I continued reading down the thread.

Away hopped the old gentleman rabbit, his heart going "pitter-patter-pat," he was so frightened.

There was stillness; no battery, however distant, no pitter-patter of rifle fire, no chattering report of the machine guns.

Jack a little later heard the cat-like steps of its mate leaving the place, until the pitter-patter died away in the distance.

You could hear them as they beat,—pitter patter, pitter patter, pitter patter down the street.

You could hear them as they beat pitter patter, pitter patter, pitter patter down the street.