《汉字解码学》15 “刀”是用坚砺石块磨制的手持工具和兵器 15 "Knife" is a hand-held tool and a weapon that is ground with a hard stone.

《汉字解码学》15 “刀”是用坚砺石块磨制的手持工具和兵器。

刀    甲骨文象古代有刃有把之刀形。《说文》注：“兵器也。象形。”刀义为一种常用兵器，也是一种劳动工具。泛指各种用刀。古人砍伐树木、荆棘，实行“刀耕火种”，就是用石刀、石斧进行的。

dāo

刀 Ⅰ(名) ① knife; sword ② sth. shaped like a knife Ⅱ(量) one hundred sheets (of paper)

15  "Knife" is a hand-held tool and a weapon that is ground with a hard stone.
Knife bone as the ancient blade has a knife-shaped. "Said the text" Note: "weapons also. Pictograms." Knife as a commonly used weapons, but also a tool of work. Refers to a variety of knives. The ancient felling of trees, thorns, the implementation of "slash and burn", is a stone knife, stone axes.
Dāo
A knife, a knife, a knife, a knife, a knife, a knife,