impoverish - definition and synonyms

verb [transitive] 

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/ɪmˈpɒvərɪʃ/
present tense
I/you/we/theyimpoverish
he/she/itimpoverishes
present participleimpoverishing
past tenseimpoverished
past participleimpoverished
  1. 2
    to reduce the quality of something

derived word

impoverishment

noun [uncountable]