couldest

could·est

 (ko͝od′ĭst) or couldst (ko͝odst)
aux.v. Archaic
A second person singular past tense of can1.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Then said Antonius: o noble Eros, I thanke thee for this, and it is valiantly done of thee, to shew me what I should do to my selfe, which thou couldest not do for me.
Lives and letters in Antony and Cleopatra
'Thou couldest have no power at all against me except it were given
The politics of forbidden liaisons: civilization, miscegenation, and other perversions
Gladstone's working drafts confirm his uncertainty about the appropriate tone to adopt for this passage.(10) For lines 9--10, he had written 'Thee, who thou art/I know not', which, although repetitive, is clear and emphatic; and line 19 was originally 'But what to boot thou couldest not have heard', which is both less mannered and more accurate than the final version.
'Not an after-dinner relaxation': Gladstone on translating Dante
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