英和和英

to do all one can―do everything in one's power―do one's best―do my utmost

doing one's best

by main strength

to make efforts

I will do all I can―do everything in my power―do my best.

to do all one can―do everything in one's power

to do one's best

to do one's best―do one's utmost―throw all one's energies into the work

do one's duty

the act of putting a great deal of effort (into something)

I will do my best.

Do your best.

an act of indulging in the greatest luxury possible

to display one's ability

make one's (best) endeavor(s)

Do your best [utmost].

to concentrate all one's powers on one object―bring all one's energies to bear upon one object

gather one's energies

to do all that one can do

to do something with all one's strength

Do your very best.

the action of confronting something with all one's energy

I worked with all my might.

I will do my best.

Let's do our best!

to exhibit one's powers―go through one's paces

to put one through one's paces

to concentrate one's powers on one's object

I will do my best when I am put to the push.

Give it all you've got.