-est (1)youdaoicibaDictYouDict[-est 词源字典]
"Forming the superlative of adjectives (such as shortest, widest), and of adverbs (such as soonest)", Old English -ost-, -ust-, -ast-.[-est etymology, -est origin, 英语词源]
-est (2)youdaoicibaDictYouDict
"Forming the second person singular of verbs", Old English -est, -ast, -st.