tap

The blunt accusation, the brutal tap upon the shoulder—what can one make of such a denouement?

It came slowly along the passage, and there was a feeble tap at the door.

Neither of them had time to speak, however, before there was a tap at the door, and the spokesman of the street Arabs, young Wiggins, introduced his insignificant and unsavoury person.

He tiptoed along the hall and stood for several minutes outside the door of the east gable before he summoned courage to tap on it with his fingers and then open the door to peep in.