し尽つくす

godan verb (-su), transitive verb

do everything possible; leave nothing undone; exhaust all efforts

Emphasizes carrying out an action to the fullest extent, leaving no stone unturned. Often used with verbs of effort or preparation.

• できることはし尽つくした。

  I did everything I could.

• 準じゅん備びはし尽つくしたので、あとは本ほん番ばんを待まつだけだ。

  We've made every possible preparation, so now we just wait for the actual event.