Diminish has 3 different meanings across 1 category:
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"
lessen the authority, dignity, or reputation of
"don't belittle your colleagues"
To make smaller.
"The new tax laws will diminish our family's annual savings by nearly half."