鞠躬盡力

guk1 gung1 zeon6 lik6

to bend to a task and spare no effort (idiom); striving to the utmost · same as 鞠躬盡瘁|鞠躬尽瘁[ju1 gong1 jin4 cui4]{guk1 gung1 zeon6 seoi6}