to the best of ability
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to the best of (one's) ability
To the limit of one's skills, resources, or energy; as well as one is able to do. I tried to the best of my ability to secure a seat at the event, but it was impossible to find tickets. Police have been searching to the best of their abilities, but so far there has been no sign of the missing teenager.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
to the best of one's ability
as well as one is able. I did the work to the best of my ability. You should always work to the best of your ability.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.