To reveal or disclose something that was hidden in the heart or mind; to unburden oneself of secrets.
From 'dis-' (out, away) combined with 'embosom' (to keep in one's bosom or heart). The prefix suggests removal or reversal, so the word means to take something out from the innermost part.
Shakespeare and other Renaissance writers loved this word because the 'bosom' was considered the seat of deep emotions—so to disembosom meant a real emotional unburdening. It's the Elizabethan version of 'getting something off your chest.'
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