Definitions from Wiktionary ( )

▸ noun:  A device designed to be placed in the mouth and blown, or driven by steam or some other mechanism, to make a whistling sound.
▸ noun:  An act of whistling.
▸ noun:  A shrill, high-pitched sound made by whistling.
▸ noun:  Any high-pitched sound similar to the sound made by whistling.
▸ noun:  (Cockney rhyming slang) A suit (from whistle and flute).
▸ noun:  (colloquial) The mouth and throat; so called as being the organs of whistling.
▸ verb:  (ambitransitive) To make a shrill, high-pitched sound by forcing air through the mouth. To produce a whistling sound, restrictions to the flow of air are created using the teeth, tongue and lips.
▸ verb:  (ambitransitive) To make a similar sound by forcing air through a musical instrument or a pipe etc.
▸ verb:  (intransitive) To move in such a way as to create a whistling sound.
▸ verb:  (transitive) To send, signal, or call by a whistle.
▸ verb:  (intransitive, Opus Dei, slang) To request admission to Opus Dei, a Roman Catholic organization.

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