落ちこむ

(1)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"

(2)サイズ、または範囲を縮小する

(3)go down in value; "Stock prices dropped"

(4)価値の下落

(1)