to do exactly what one is told to do; to be subservient; to be easily controlled
彼は上司の言いなりになることが多い。
He often does exactly what his boss tells him to do.
彼はいつも親の言いなりになった。
He always did exactly what his parents told him.
彼女は友人の言いなりになっている。
She is easily controlled by her friends.