Qahah קָהָה

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Qahah (Hebrew קָהָה, Strong's H6949) is a Hebrew verb meaning “be blunt”. It occurs 4 times in 4 verses of the Old Testament.

Definition

1) to be blunt, be dull
1a) (Qal) to be blunt, be dull
1b) (Piel) to be blunt

From the STEPBible Brief Lexicon of Hebrew (based on the abridged Brown-Driver-Briggs), STEPBible.org, CC BY 4.0.

KJV	edge (3), blunt (1)
BSB	are set on edge (2), is dull (1), will be set on edge (1)

Every verse with Qahah, with the English words that translate it highlighted (KJV or BSB; other translations show the KJV here).

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.If the axe is dull and the blade unsharpened, more strength must be exerted, but skill produces success.

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.“In those days, it will no longer be said: ‘The fathers have eaten sour grapes, and the teeth of the children 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.Instead, each will die for his own iniquity. If anyone eats the sour grapes, his own teeth will 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?“What do you people mean by quoting this proverb about the land of Israel: ‘The fathers have eaten sour grapes, and the teeth of the children are set on edge’?

Definition and verse list from STEPBible's tagged Hebrew Old Testament (TAHOT) and Greek New Testament (TAGNT) and Brief Lexicons, STEPBible.org, CC BY 4.0.
English renderings from the public-domain KJV with Strong's numbers (eBible.org) and the Berean Standard Bible interlinear (public domain).