吃苦头
Suffer a great deal.

【发音】chī kǔ tóu

【释义】尝到了苦味儿。比喻遭痛苦，受磨难。
            To taste bitterness; figuratively: to go through hard times.

【例1】你现在不下功夫，日后会吃苦头的。
           If you don't work hard now, you'll suffer for it later.

【例2】他脸上看上去很苍白，似乎吃了不少苦头。
           He looked very pale and seemed to have suffered a great deal.