Made a clear, high-pitched sound by forcing air through your lips, often to play a tune or get someone's attention.
From Old English 'hwistlian', onomatopoeia imitating the sound itself; whistle has been documented since at least the 1200s.
Ancient Greeks believed whistling could summon spirits or bad luck—a superstition so persistent that some cultures still avoid it at night, and sailors famously consider whistling on a ship bad luck.
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