Learn the tone, meaning, and better English alternatives around "have a key" with real scene examples.

This means a witness or piece of evidence could change the situation in their favor.
From Undercovered Heart, Episode 51
Someone says they have evidence that could change the outcome of a serious case.
Use it in legal, work, or conflict situations when new information may help your side. The exact line is context-heavy and not ideal for a standalone phrase page.
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