Learn what "it's a missing piece to the puzzle" means, when people say it, and how to use it naturally in English.

It means this clue completes the explanation or helps solve the problem.
From Mysterious Murderer, Episode 28
Someone says a clue or fact fills in what was missing in the investigation.
Use this when one detail helps make a bigger situation understandable. It is common and natural in both casual and work conversations.
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