Short for 'synchronization'; in swimming, synchronized movements done by multiple swimmers in perfect timing.
From Greek 'synchronos' meaning 'at the same time' (syn- = together, chronos = time). Modern shorthand from 20th century sports terminology.
Synchronized swimming judges watch for athletes to move with microsecond precision while underwater and holding their breath—it's basically underwater ballet, and the synchronization is so strict that even a quarter-second difference breaks the illusion.
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