We have no meanings for "knock thrice" in our records yet.
1 With the rod knock thrice at the iron door of the castle, and it will spring open.
2 At a loss for a moment, he lifted his hand to knock thrice on the corrugated door.
3 Before going into the sitting-room the grandmother knocked thrice at the door.
4 Carmen went up to the door, whistled softly, and knocked thrice .
5 Knock thrice at the latter, and it will be opened.
6 The older man gave the younger a shrewd glance, and knocked thrice at the door.
7 Leaving it, we came to a door in the wall on which my companion knocked thrice .
8 He sped faster now, and presently came to two great doors, on which he knocked thrice .
9 I knocked thrice , and received no reply.
10 He knocked thrice and entered.
11 Even that was withdrawn; for the guide, having knocked thrice at a door, blew out the candle, and retreated down-stairs.
12 I knocked once, I knocked twice, I knocked thrice , and then the door opened and I enjoyed a fresh sensation.
13 The "little maid" was still lingering, but she added mysteriously, "She'll be knocking thrice at her mother's door to-morrow."
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