endeavour - definition and synonyms

verb [transitive] formal 

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/ɪnˈdevə(r)/
present tense
I/you/we/theyendeavour
he/she/itendeavours
present participleendeavouring
past tenseendeavoured
past participleendeavoured
  1. to try very hard to do something
    endeavour to do something:

    We have endeavoured to make the vehicle environmentally friendly.