-est

1

Origin of -est

1
Middle English; Old English -est, -ost. Compare Greek -isto-

-est

2
  1. a native English suffix formerly used to form the second person singular indicative of verbs: knowest; sayest; goest.
Also -st.

Origin of -est

2
Middle English; Old English -est, -ast, -st, 2nd person singular present indicative endings of some verbs (-s earlier verbal ending + -t, by assimilation from thū thou1) and 2nd person singular past endings of weak verbs (earlier -es + -t)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -est

-est

1
suffix
  1. forming the superlative degree of adjectives and adverbsshortest; fastest

Word Origin for -est

Old English -est, -ost

-est

2

-st

suffix
  1. forming the archaic second person singular present and past indicative tense of verbsthou goest; thou hadst

Word Origin for -est

Old English -est, -ast
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012