do level best

do your level best

to try very hard to do something (often + to do sth) Tickets are quite hard to come by but I'll do my level best to get you one.

Name	Pronounced	Usage
Adonis	[ə'dəunis]
Hill	[hil]
Marquis	mahr-KEE	African American
Khariton	-	Russian
RÚNi	-	Ancient Scandinavian
Emmeline	EM-ə-leen, EM-ə-lien	English (Archaic)