level best

Johnson admitted mistakes were made and that "there were unquestionably things we should have done differently", but insisted that ministers had done their "level best" in difficult circumstances.

Campbell did his level best to ensure that cooler heads would prevail, that the band wouldn’t collapse under the weight of expectations.

But she is trying her level best to authentically communicate, without these filters.

The broligarchs bending the knee to the current administration continue to do their level best to destroy the media, but there are still people in the press that, I’m sure, have questions about all this.

He said he took "personal responsibility for all decisions made" but insisted that ministers had done their "level best" in difficult circumstances.