Weather vaning is when a ship/boat/wings of a windmill/aircraft is allowed to spin in the direction of wind freely. Its basically allowed so that no damage/breakage to the equipement/machinery happens due to the force of the moving wind.
Janitor: Do you like vanning?
Molly Clock: I don't know what that is.
Janitor: Sort of like taking a long drive in a car... except in a van.
Molly Clock: ...still not getting it
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