Grapes can be used to make wine sour grapes.

Sour grapes, though, do not sound so tasty.

Did your buddy Craig ask my friend Morgan out for a second date yet?

Well, he did, and she turned him down.

But Craig told me he wasn't that interested in her, anyway.

Sounds like sour grapes to me, Probably right.

This phrase comes from the ancient Greek storyteller.

A fox tries to eat some grapes from a vine, but they are too high for the fox to reach, So the Fox claims the grapes are probably sour.

Anyway.

When someone has a case of sour grapes, they criticize something desirable that they know they cannot have, just like Craig did after Morgan turned him down.

And that's English in a minute.