They could hear the sharp ping of the bullets round them.

The old woman limped pitifully to the middle, when a shrill ping rang out.

The human voice supplies the libretto, while the accompaniment is provided by a syncopated and tympanum-piercing ping-ping, suggestive of a giant mosquito singing to its young.

But bird-ie hop-ping in his door, Tired of his free-dom, back once more.