Word origin
(sense 1) ME < OE
-est, -ost, -ast, superl. suffix of adj. & adv., akin to OHG
-isto < IE *
-istho- (> Gr
-isto-, Sans
-išṭha-); (sense 2) ME < OE
-est, -ast, 2d pers. sing., pres. tense inflection < IE *
-si, *-s + initial dental of enclitic pron.: see thou
1