Archaic second-person singular form of 'could' used with 'thou' in older English texts.
Old English past tense 'cuðe' (could) with the archaic second-person singular ending '-st,' creating 'thou couldst' for direct address to one person.
The word 'thou' and its matching verb endings create poetry because they sound formal and intimate at once—Shakespeare used them to make emotional moments feel special!
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