Decrease and Lowering

decrease

A change downward.
- usage: "there was a decrease in his temperature as the fever subsided"; "there was a sharp drop-off in sales"
- synonyms: lessening, drop-off
A process of becoming smaller or shorter.
- synonyms: decrement
The amount by which something decreases.
- synonyms: decrement
The act of decreasing or reducing something.
- synonyms: diminution, reduction, step-down

Decrease in size, extent, or range.
- usage: "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper"
- synonyms: diminish, lessen, fall
Make smaller.
- usage: "He decreased his staff"
- synonyms: lessen, minify

(v.t.) To cause to grow less; to diminish gradually; as, extravagance decreases one's means.
(v.) A becoming less; gradual diminution; decay; as, a decrease of revenue or of strength.
(n.) To grow less, -- opposed to increase; to be diminished gradually, in size, degree, number, duration, etc. or in strength, quality or excellence; as, they days decrease in length from June to December.
(v.) The wane of the moon.

Webster's Revised Unabridged Dictionary

lowering

Move something or somebody to a lower position.
- usage: "take down the vase from the shelf"
- synonyms: lower, take down, let down, get down, bring down
Set lower.
- usage: "lower a rating"; "lower expectations"
- synonyms: lower, lour
Make lower or quieter.
- usage: "turn down the volume of a radio"
- synonyms: turn down, lower, lour
Cause to drop or sink.
- usage: "The lack of rain had depressed the water level in the reservoir"
- synonyms: lower, depress
Look angry or sullen, wrinkle one's forehead, as if to signal disapproval.
- synonyms: frown, glower, lour, lower

Darkened by clouds.
- usage: "a heavy sky"
- synonyms: heavy, sullen, threatening

Webster's Revised Unabridged Dictionary