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New American Oxford Dictionary

couldst

couldst |ko͝odst kʊdst |(also couldest |ˈko͝odist |) verb archaic second person singular of could.

 

Sanseido Wisdom Dictionary

couldst

couldst /kʊdst /助動詞 ⦅古 ⦆(thouを主語として )can 1 の二人称単数直説法過去形 .