do one's best

Verb

do one's best (third-person singular simple present does one's best, present participle doing one's best, simple past did one's best, past participle done one's best)

1. (idiomatic) To do as best one can.
   • The engine was a diesel, No. D207, with a crew obviously out to do their best.1960 April, O. S. Nock, “British Locomotive Practice and Performance”, in Railway Magazine, page 269
   • This is a sad time for all people. We have suffered a loss that cannot be weighed. For me, it is a deep personal tragedy. I know that the world shares the sorrow that Mrs. Kennedy and her family bear. I will do my best. That is all I can do. I ask for your help — and God's.1971 [1963 November 22], Lyndon Johnson, “The Beginning”, in The Vantage Point, Holt, Reinhart & Winston, →ISBN, →LCCN, →OCLC, page 17

   Synonyms:

   try one's best, do one's utmost, give it one's best shot