#RejectedAndTurnedDown

碰钉子 (pèngdīngzi) Being rejected / Being turned down 

The character “碰 (pèng)” means to run into; “钉 (dīng)” means nail or tack

and “子 (zi)” is used as a suffix here.

Tā zài bànshì de shíhou pèngle dīngzi, huíjiā hòu xīnqíng bùhǎo. 他在办事的时候碰了钉子，回家后心情不好。

He …