To fail to appreciate or to depreciate in value; to reduce in worth or value.
From 'dis-' (reversal prefix) + 'appreciate' (from Latin 'appretiare,' to set a price on). The prefix 'dis-' negates or reverses the meaning of 'appreciate,' creating a word meaning to undervalue or to lose value.
This word is nearly extinct in modern English because we just use 'depreciate' instead—adding 'dis-' to words that already have negative meanings is redundant! But in older texts, you'll find 'disappreciate' used intentionally to emphasize the severity of loss.
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