Cry Wolf -

: A bored shepherd boy repeatedly tricks villagers by shouting "Wolf!" when no danger is present.

: When a real wolf eventually attacks the flock, the villagers ignore the boy's genuine cries for help, assuming it is another prank. Cry Wolf

: Traditionally, the story teaches that "liars are not believed even when they speak the truth". 2. The "Cry Wolf Effect" in Psychology : A bored shepherd boy repeatedly tricks villagers

The phrase originates from one of Aesop's Fables dated back to approximately 600 BC. Cry Wolf

Modern psychology uses this fable to describe the (or phenomenon), where frequent false alarms lead to a decreased response to future warnings.