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(psychology, usually uncountable) A state of mind producing serious, long-term lowering of enjoyment of life or inability to visualize a happy future.
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(psychology, countable) A period of low morale or unhappiness (a period of experiencing the above-mentioned state of mind) which lasts longer than several weeks and may include ideation of self-inflicted injury or suicide.
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(geography) An area that is lower in topography than its surroundings.
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(meteorology) An area of lowered air pressure that generally brings moist weather, sometimes promoting hurricanes and tornadoes.
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(economics) A period of major economic contraction.
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(economics, US) Four consecutive quarters of negative, real GDP growth. See NBER.
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The act of lowering or pressing something down.
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(biology, physiology) A lowering, in particular a reduction in a particular biological variable or the function of an organ, in contrast to elevation.