SLAY, pret. slew pp. slain. The proper sense is to strike, and as beating was an early mode of killing, this word, like smite, came to signify to kill. It seems to be formed on the root of lay as we say to lay on.
1. To kill to put to death by a weapon or by violence. We say, he slew a man with a sword, with a stone, or with a club, or with other arms but we never say, the serif slays a malefactor with a halter, or a man is slain on the gallows or by poison. So the slay retains something of its primitive sense of striking or beating. It is particularly applied to killing in battle, but is properly applied also to the killing of a individual man or beast.
2. To destroy.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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