[n] the act of decreasing or reducing something
[n] the amount by which something decreases
[n] a change downward; "there was a sharp drop-off in sales"
[n] a process of becoming smaller or shorter
[v] decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fall to under a hundred pounds"; "his voice fell to a whisper"
[v] make smaller; "He decreased his staff"
decrement, decrement, diminish, diminution, drop-off, fall, lessen, lessening, minify, reduction, step-down