spare no effort

Verb

spare no effort (third-person singular simple present spares no effort, present participle sparing no effort, simple past and past participle spared no effort)

1. (idiomatic) To do everything within one's powers to achieve something.
   • This reflects credit not only on the railway staffs concerned but on the various signalling firms, which have spared no effort to carry out research work, and test and apply, when feasible, every new idea.1951 April, T. S. Lascelles, “British Railway Signalling Since 1925”, in Railway Magazine, number 600, page 232
   • The railways are fully alive to the position, and are sparing neither effort nor expense to provide more attractive trains and to effect economies, but in such circumstances some curtailment of services is inevitable.1958 May, “Railway Difficulties in the U.S.A.”, in Railway Magazine, page 296