N-UNCOUNT 躲藏;藏匿 If someone is in hiding, they have secretly gone somewhere where they cannot be seen or found.

N-COUNT 痛打;狠揍 If you give someone a hiding, you punish them by hitting them many times.

PHRASE 白白浪费时间;白费工夫;毫无成功希望 If you say that someone who is trying to achieve something is on a hiding to nothing, you are emphasizing that they have absolutely no chance of being successful.