conserve - definition and synonyms

verb [transitive] 

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/kənˈsɜː(r)v/
present tense
I/you/we/theyconserve
he/she/itconserves
present participleconserving
past tenseconserved
past participleconserved
  1. 2
    to use very little of something such as electricity or water so that it is not wasted