More than one cyclone runs out of force (4)

I believe the answer is:

lows

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'more than one cyclone' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for lows that I've seen before include "Moos" , "Cyclones" , "Depressions" , "Minimum levels" .)

I've seen this clue in The Times.

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