I heard a sharp tap on my passenger-side window and turned quickly.

He was right; at the end of some seconds two sharp taps were heard inside.

Then, drawing out a short steel instrument, he gave the paper a sharp tap.

He had not been gone two minutes when there were three short, sharp taps at my window.

He gave her stomach a sharp tap, and she turned from him, saying, "Oh you!"

There was a sharp tap at the door and Bundle entered.

There had been a sharp authoritative tap on the door.

I felt a sharp tap on my shoulder and turned around.

Then a sharp tap at the door had him swiftly out of his chair.

She got a sharp tap on the beak from Jack.