Middle English;Old English-est, -ast, -st, 2nd person singular present indicative endings of some verbs (-s earlier verbal ending + -t, by assimilation from thūthou1) and 2nd person singular past endings of weak verbs (earlier -es + -t)
British Dictionary definitions for -est
-est1
suffix
1.
forming the superlative degree of adjectives and adverbs: shortest, fastest
Word Origin
Old English -est, -ost
-est2
suffix
1.
forming the archaic second person singular present and past indicative tense of verbs: thou goest, thou hadst