Meaning of there's many a slip 'twixt cup and lip in English:

there's many a slip 'twixt cup and lip

phrase

proverb
  • Many things can go wrong between the start of a project and its completion; nothing is certain until it has happened.

    ‘But there's many a slip twixt cup and lip as one goes from generalities to specifics.’
    • ‘Of course many things can go wrong, there's many a slip 'twixt cup and lip, but that's not the point I'm making.’
    • ‘But there's many a slip twixt cup and lip, especially in the gold mining business.’