-est
- forming the superlative degree of most adjectives and adverbs of one or two syllables: greatest, soonest
- forming the archaic 2d pers. sing., pres. indic., of verbs [goest]: in certain cases, it becomes -st: hadst
See -est in American Heritage Dictionary 4
suffix Used to form the superlative degree of adjectives and adverbs: greatest; earliest.
or -st
suffix Used to form the archaic second person singular of English verbs: comest.
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