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

there's many a slip twixt cup and lip

Even something that one feels confident will succeed can have disastrous problems before it concludes. "Twixt" is a shortening of "betwixt," itself an archaic form of "between." Everything seems to be going smoothly, but there's many a slip twixt cup and lip, so don't lose focus until we're over the finish line.
See also: and, cup, lip, many, slip, twixt

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

. Prov. Many things may happen to prevent you from carrying out what you intend to do. Bob: Now that I have a contract with a publisher, nothing in the world can stop me from writing this book. Alan: Don't be so sure. There's many a slip 'twixt the cup and the lip.
See also: and, cup, lip, many, slip
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There's many a slip 'twixt the cup and the lip, goes the old English proverb.
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