say it: WI-sling
whistling is a noun meaning "the sound made by something moving rapidly or by steam coming out of a small aperture". It carries 3 recorded senses.
the act of signalling (e.g., summoning) by whistling or blowing a whistle
“the whistle signalled the end of the game”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for whistling come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.