Decrease

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.

To cause to grow less; to diminish gradually; as, extravagance decreases one's means.

A becoming less; gradual diminution; decay; as, a decrease of revenue or of strength.

The wane of the moon.

a change downward; "there was a decrease in his temperature as the fever subsided"; "there was a sharp drop-off in sales"

decrease in size, extent, or range; "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"