do someone's level best

Apprentices do their level best
Do Your Level Best!; There's No Need to Despair If Tomorrow's A Level Results Are Disappointing THE Scramble for University Places B...
A Company's Level Best
Football: O'Leary Grasps History FA Premiership: Leeds Do Their Level Best to Match Record Winning Run of Legendary Seventies Side
Football: New Legend Driven to Do His Level Best Norman Fox Explains How Sir Matt's Faith Can Be Joyously Fulfilled
Citroen's Level Best
FOOTBALL: LENNON IS SORELY MISSED AS McILROY'S MEN STRUGGLE TO DO THEIR LEVEL BEST; N. IRELAND 0 CYPRUS 0
Attempting to do their level best
Corps will do its level best to fill lake ; But low snowpack and power crunch are working against Pend Oreille
Patriots will do their level best