qa.hah describes becoming dull or blunted, of an iron edge and of teeth in sayings about sour grapes.

The predominant attested use occurs in the repeated saying that fathers or individuals eat sour grapes and teeth are affected; a separate occurrence describes an iron edge as dull before it is sharpened.

1. Teeth affected in the sour-grapes saying · dominant

   In Ezekiel 18:2, Jeremiah 31:29, and Jeremiah 31:30, the Qal imperfect feminine plural form occurs in the clause about teeth after eating unripe or sour grapes. The APB renders the resulting clause as teeth being “set on edge,” but it is a whole-verse translation to the Hebrew form.

   Ezekiel 18:2Jeremiah 31:29Jeremiah 31:30
2. A dull iron edge · occasional

   In Ecclesiastes 10:10, the Piel perfect masculine singular form describes iron in the conditional clause before its edge is sharpened. The APB renders the iron as “blunt” and contrasts failure to sharpen it with the need for greater strength.

   Ecclesiastes 10:10

In the Anselm Project Bible: The APB presents the Ecclesiastes clause with “blunt” iron, while in the sour-grapes clauses it says teeth are “set on edge.” These renderings confirm the verse contexts rather than establish separate English equivalents.