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calm
(redirected from calm down)

   Also found in: Dictionary/thesaurus, Legal, Idioms, Wikipedia 0.03 sec.
calm
Meteorol of force 0 on the Beaufort scale; without wind

calm [käm]
(meteorology)
The absence of apparent motion of the air; in the Beaufort wind scale, smoke is observed to rise vertically, or the surface of the sea is smooth and mirrorlike; in U.S. weather observing practice, the wind has a speed under 1 mile per hour or 1 knot (1.6 kilometers per hour).


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