Newsspeak would eliminate jargon with alternative meanings until eventually only one word exists which is similar to the sound when a duck quacks
Repeating the same word out loud like a mantra would block other words from being verbally thought in the mind
Duck speak claim is shared in both George Orwell's 1984 & also Snapping Americas Epidemic of Personality Change by Conway and Flo if I remember the book title and author correctly but it is called Transcendental Meditation