Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: diminue (14-16 centuries), from Old French diminuer, from Latin minuere 'to make less'

diminish

verb
     
di‧min‧ish
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.
2 [transitive] 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.
3

diminishing returns

when the profits or advantages you are getting from something stop increasing in relation to the effort you are making

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