LOW (3):

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• 4

   supply

   if you are low on something, or if your supply of something is low, there is not much of it left
• be/get/run low (on something)
• We're running low on gas.
• Stocks are getting low.
• 5

   sound

   a low voice or sound is quiet or deep:
• I heard a low moaning noise.
• The volume is too low - turn it up.
• a low whisper
• 6

   light

   a light that is low is not bright [= dim]:
• Use low lighting to give the room a romantic atmosphere.
• 7

   heat

   if you cook something over a low heat or in a low oven, you cook it using only a small amount of heat [≠ high]
• 8

   battery

   a battery that is low does not have much power left in it
• 9

   clothes

   a low dress, blouse etc does not cover your neck and the top of your chest [↪ low-cut]
• 10

   unhappy

    [not before noun] unhappy and without much hope for the future[= depressed]:
• He was feeling a bit low, so I did my best to cheer him up.
• Terry seems to be in rather low spirits today.

• ➔ be at a low ebb

    at ebb1 (2)
• —lowness noun [uncountable] 

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.