Crossword Genius

Second person's half-expressed ideas (4)

Ross

I believe the answer is:

thou

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'second person's' is the definition.
(historical second person pronoun)

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(Other definitions for thou that I've seen before include "You (arch.)" , "You (formerly)" , "You, in olden times" , "Old-fashioned pronoun" , "Old English pronoun" .)

I've seen this clue in The Guardian.
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