I. adjective suffix or adverb suffix
Etymology: Middle English, from Old English -st, -est, -ost; akin to Old High German -isto (adjective superlative suffix), Greek -istos
— used to form the superlative degree of adjectives and adverbs of one syllable
fatt est
lat est
of some adjectives and adverbs of two syllables
lucki est
often est
and less often of longer ones
beggarli est
II. verb suffix
or -st
Etymology: Middle English, from Old English -est, -ast, -st; akin to Old High German -ist, -ōst, -ēst, 2d singular ending
— used to form the archaic second person singular of English verbs (with thou )
did st
can st