Strong’s Hebrew
H6949 — qahah
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
קָהָה
qahah — pronounced kaw-haw
a primitive root; to be dull:--be set on edge, be blunt.
4 occurrences in the KJV.
Ecclesiastes 10:10
If the iron be blunt, and he do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.
Jeremiah 31:29
In those days they shall say no more, The fathers have eaten a sour grape, and the children’s teeth are set on edge.
Jeremiah 31:30
But every one shall die for his own iniquity: every man that eateth the sour grape, his teeth shall be set on edge.
Ezekiel 18:2
What mean ye, that ye use this proverb concerning the land of Israel, saying, The fathers have eaten sour grapes, and the children’s teeth are set on edge?