The 'whispering neighbours' refer to those who speak in hushed tones, often gossiping or spreading rumors, symbolizing the subtle influence of society or individuals who pass judgment without open confrontation.
In W.H. Auden's poem "Now the Leaves Are Falling Fast," the 'whispering neighbours' are agents of death or messengers of mortality. They are described as figures who "pluck us from the real delight," symbolizing the forces that surround human life, constantly reminding us of our impending end and trying to separate us from true happiness.