Opened up or spread out something that was rolled or folded, like a flag or sail.
From un- (not) + furled (rolled up), derived from Old French fourrer (to line or sheathe). The 'furl' part comes from the idea of rolling something tight, so 'unfurl' is the opposite.
When flags are unfurled in slow-motion movies, it's actually one of the hardest things to film because real flags move too fast and randomly—filmmakers often use special weighted flags or even CGI to make it look dramatic!
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