decrease, diminish, lessen, fall (verb)
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"
decrease, lessen, minify (verb)
"He decreased his staff"
subside, lessen (verb)
wear off or die down
"The pain subsided"
To make less; to diminish; to reduce.
To become less.