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Definition of diminish : 1. To become or appear less or smaller; to lessen; as, the apparent size of an object diminishes as we recede from it.
2. To lessen the authority or dignity of; to put down; to degrade; to abase; to weaken.
3. To make smaller by a half step; to make ( an interval) less than minor; as, a diminished seventh.
4. To make smaller in any manner; to reduce in bulk or amount; to lessen; - opposed to augment or increase.
5. To take away; to subtract.

Synonyms:

flow, return, mitigate, accrue, ebb, pass, denigrate, light, fall down, moderate, shine, hang, fall, settle, come down, pick at, go down, precipitate, come, let up, increase, strike, rebate, minify, descend, decline, devolve, wane

fragment, discontinue, reduce, minimize

crop, clip, nip, downgrade, prune, pare, trim, shave, condense, cull, shear, weed, bob, lighten, taper

delete, elide, subtract, dock, cut

defame, detract, abrade, malign, derogate, decry, cast aspersion, disparage, depreciate, discount

devalue, degrade, mark down, slash, debase, devaluate, cheapen, belittle

deaden, dull, soften, desensitize, blunt

subordinate

decrease, lessen, drain, deduct, abate, dwindle, deplete, decrement, concentrate, compress, shrink, recede, erode, truncate, abridge, contract, deflate, curtail, lower, subside, shorten, compact, abbreviate, die down

undersell

Usage examples:

• The ladies addressed me simultaneously, one of them, I believe, asking me what I meant by it and the other demanding how dared I, which had the sole effect of adding to my bewilderment, nor did the words of Cousin Egbert diminish this. - "Ruggles of Red Gap", Harry Leon Wilson.
• This change in her seemed to grow, rather than diminish. - "Foul Play", Charles Reade Dion Boucicault.
• That they possess by virtue of their sovereign power within their own limits in as full a manner before as after the purchase of the Indian lands; nor can this Government add to or diminish it. - "Complete State of the Union Addresses from 1790 to the Present", Various.