The most sour, bitter, or harsh; the greatest degree of sharpness or severity in taste, manner, or tone.
Superlative form of 'acerb' from Latin 'acerbus'. The superlative '-est' suffix creates the highest degree of the quality being described.
English uses the same '-est' suffix for superlatives that Old English speakers used 1,000 years ago—one of the most ancient grammar patterns we still use!
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