level best

No matter which way you pitch the car and across whatever wobbly surface, this powerful system is doing its level best to keep you level.

"It is clear from the evidence that the three of them were trying their level best not to run afoul of the law," he said.

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.