(idiomatic) Worthless or pointless.

(idiomatic) To ask for with no chance of success. / Used other than figuratively or idiomatically: see whistle, for.

present participle of whistle for

plural of dog whistle

Third-person singular simple present indicative form of whistleblow

past participle of whistleblow

simple past tense of whistleblow

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

plural of fox whistle

plural of slide whistle