|Origin:||diminue (14-16 centuries), from Old French diminuer, from Latin minuere 'to make less'|
1 [intransitive and transitive]
to become or make something become smaller or less [= reduce]:
The party's share of the electorate has diminished steadily.
These drugs diminish blood flow to the brain.
to deliberately make someone or something appear less important or valuable than they really are:
Don't let him diminish your achievements.
But that's not to diminish the importance of his discoveries.
when the profits or advantages you are getting from something stop increasing in relation to the effort you are making