The condition in a line of poetry where two syllables are missing from the expected metrical pattern at the end.
From di- (two) + catalexis (Greek katalexis, incompleteness). Technical term from prosody combining Greek roots to name the missing-syllable phenomenon.
Ancient Greek and Latin poets had precise names for every possible rhythm break—dicatalexis was their way of saying 'we're dropping the last two beats, trust us, it works!'
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