There are 2 definitions of -est in English:

-est1

suffix

Forming the superlative of adjectives (such as shortest, widest), and of adverbs (such as soonest).

Origin

Old English -ost-, -ust-, -ast-.

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Pronunciation: ˈkroudˌsôrs
verb
obtain (information) by enlisting help of many people…

There are 2 definitions of -est in English:

-est2

(also -st)

suffix

archaic
Forming the second person singular of verbs: canst goest

Origin

Old English -est, -ast, -st.

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Definition of -est in: