(transitive) To gather (especially people or dogs) together, calling them by whistling.

plural of rape whistle

A whistle intended to be blown by a person who believes he/she is in danger of being raped.

Alternative form of whistle pig

plural of whistle pig

Alternative form of whistle-stop

(rare) To blow the whistle (on); to report (as a whistleblower).

(idiomatic) Worthless or pointless.

plural of dog whistle

(sports) To continue playing until the referee has blown his whistle to stop play