What it does
I'm not aware of "Run and Hide" as an official Magic: The Gathering keyword or ability. It doesn't appear in the comprehensive rules or on any standard cards I can verify.
It's possible you're thinking of a similarly named ability, a card-specific phrase, or content from an unofficial/custom set. For example, you might mean Hideaway (exile a card face-down when the permanent enters, playable later under a condition) or perhaps a flavor name for evasion abilities.
If you can share the card name or its exact text, I'll happily break down what it does, the rules nuance players trip over, and how it plays out in Commander. I'd rather flag the uncertainty than invent mechanics that could mislead your deckbuilding.
Iconic cards with Run and Hide
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