lessen

verbs

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, diminish, fall, lessen
make smaller
"He decreased his staff"
decrease, lessen, minify
wear off or die down
"The pain subsided"
lessen, subside