To talk a lot to no avail; to waste one's breath; to expend much effort in speaking.
他费舌劳唇地劝说了半天，那孩子还是不听话
He wasted his breath persuading for a long time, but the child still didn't listen.
Next Idiom
To talk a lot to no avail; to waste one's breath; to expend much effort in speaking.