The act of whistling a tune.

1. To play one a pipe.
2. To transport by pipeline; of oil, water, gas, etc.
3. To trim with piping, as of garments.

1. To give a signal by whistling.
2. To make a whining, ringing, or whistling sound; SYN. sing.
3. To make whistling sounds.
4. To move with, or as with, a whistling sound.
5. To move, send, or bring as if by whistling.
6. To utter or express by whistling.