Try (one's) level best phrase
To make as much effort as you can to do or achieve something.
Despite losing the game, I wasn't sad because I tried my level best.
I have tried my level best to defend her. I don't know what else I can do for her.
I'm not sure that I'll beat him, but I will try my level best.
I have already tried my level best to explain the concept to him, but he still couldn't understand it.
The verb "try" must be conjugated according to its tense.
The expression is of American origin and dates from the mid-19th century.
An event or activity leads to others that are unplanned or unforeseen.
My father bought a car, then a house, then a boat. One thing leads to another.