The superlative form of dizzy, meaning the most dizzy or lightheaded of all.
From the base word 'dizzy' plus the superlative suffix '-est,' a standard English comparison form. This construction has been used since Middle English to indicate the highest degree of a quality.
English comparatives like 'dizzier' and superlatives like 'dizziest' are one of the few places where we still use ancient grammatical endings—most languages either use these old endings or separate words, but English kept both systems!
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