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Verb: diminish  di'mi-nish
  1. Become smaller or less in size, extent, or range
    "The amount of homework diminished towards the end of the semester";
    - decrease, lessen, fall
  2. Lessen the authority, dignity, or reputation of
    "don't diminish your colleagues";
    - belittle

Derived forms: diminishes, diminishing, diminished

Type of: change magnitude, decrease, lessen, minify

Antonym: increase