Encara no tenim significats per a "come a knocking".
1There came a knocking at the door, and the servant disappeared.
2Later on there comes a knocking at the door, an impatient rapping, really.
3A little before sunset there came a knocking at the house-door.
4Half an hour later there came a knocking at the door.
5Now, as they were talking, behold, there came a knocking at the door.
6As the bell sounded the hour, there came a knocking at the street door.
7Then came a knocking on the window of the carriage.
8At that moment there came a knocking at the door.
9At this moment there came a knocking on the door.
10After a time, there came a knocking on my door.
11There came a knocking, a rapping, at my chamber door.
12A moment of silence, and again came a knocking-knocking-knocking
13Here there came a knocking at the front door.
14Then came a knocking upon his door, and he did not notice it at once.
15But presently there came a knocking on the door!
16At last came a knocking, knocking at the door-tap!