There's many a slip 'twixt the cup and the lip

Cultural  

1. Between the time we decide to do something and the time we do it, things often go wrong.

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Example Sentences

The play’s title is lifted from an old English expression “There’s many a slip ‘twixt the cup and the lip,” meaning a seemingly settled event can still unravel.

From Washington Times

The play's title is lifted from an old English expression "There's many a slip 'twixt the cup and the lip," meaning a seemingly settled event can still unravel.

From US News

But there’s many a slip Twixt the cup and the lip And the bottle of Poland Spring.

From Salon

Namely, such as these: It's a long lane that has no turning; There's many a slip 'twixt the cup and the lip; The worm will turn; The pitcher that goes too often to the well gets broken at last; Better Late than Never.

From Project Gutenberg

There’s many a slip ’twixt the cup and the lip.

From Project Gutenberg