1 definition by Lucy13

To relax, or to calm down; usually used as the "last word" in a conversation; usually used to take the tension out of a situation, causing each person to smile and realize they are being an idiot.
Examples of usage:
Example #1:

Jonathan: "Sarah, what did you do with my bib shorts? I told you I needed them for today's ride!"
Sarah: "Gear down, they're in the dryer."

Example #2:
Guy #1: "What's up with your outfit? Did you get dressed in the dark?"
Guy #2: "Gear down."
by Lucy13 August 1, 2009
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