It's just an old superstition that it's bad luck.
It's not!
He liked to whistle as he walked.The whistle signalled the end of the match.
The Noon Whistle was created on 1923-04-29.
The question is why would you want to whistle while eating crackers? lol.
3 long blast to the ship whistle.
That must be a habit of his/her. To sing/whistle while walking
The signal for a fire on boards is a long blast on the ship's whistle along with sounding of the vessel's general alarm.
The cord that holds a whistle is called a lanyard. You'd see this type of medium-thickness, white rope-like "neck cord" with a large whistle attached, with the whistle resting at the middle of the chest, worn around the necks of lifeguards, sports referees, etc. The term, lanyard, originally was a nautical term meaning a rope used to tie or secure something on a ship, such as the ship's rigging.
Runaway ship
7 or more short blasts on the ship whistle and general alarm bell followed by one prolonged blasts
You have to whisper in the library so you won't disturb people who are reading.
whistle while you work