1. (noun)whistle, whistling the sound made by something moving rapidly or by steam coming out of a small aperture Synonyms: pennywhistle, whistling, whistle, tin whistle
2. (noun)whistling the act of whistling a tune Synonyms: whistle
3. (noun)whistle, whistling the act of signalling (e.g., summoning) by whistling or blowing a whistle Synonyms: pennywhistle, whistling, whistle, tin whistle