To withdraw or remove a curtain; to uncover or reveal something that was hidden.
From 'dis-' (away, removal) and 'curtain' (the cloth covering). It's a simple prefix-plus-noun construction meaning to take away the curtain and reveal what's behind it.
This is a poetic and archaic word that appears in Renaissance drama—when a secret is about to be revealed, a character might 'discurtain' a hidden part of the stage. It's the theatrical equivalent of 'uncovering' or 'revealing,' suggesting a dramatic unveiling.
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