'Known' in the Bible

And Boaz answered and said to her, It has fully been shewn me, all that thou hast done to thy mother-in-law since the death of thy husband; and how thou hast left thy father and thy mother, and the land of thy nativity, and art come to a people that thou hast not known heretofore.

Wash thyself therefore, and anoint thyself, and put thy raiment upon thee, and go down to the floor; make not thyself known to the man, until he shall have done eating and drinking.

And she lay at his feet until the morning; and she rose up before one could know another. And he said, Let it not be known that a woman came into the threshing-floor.