Expresses the highest degree of something, 'the height of', 'the extreme of'.
Long explanation:
The 'Nounの至り' grammar point is used to express an extreme or the highest level of something, which can be translated as 'the height of' or 'the extreme of'. This phrase usually adds emphasis to a situation or state. Nouns commonly used with this structure include honor, happiness, regret, and shame.