Sour grapes
Meaning
Pretend not to care about something you cannot have.
Usage
Used to call out feigned indifference.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Aesop’s fable about a fox who could not reach grapes.
Used for centuries to describe rationalizing failure.