1 sentence for 窝 (wō — hollow)

1. 他感觉自己的心口窝有一阵沉闷的疼痛。

   tā gǎn​jué zì​jǐ de xīn​kǒu wō yǒu yī zhèn chén​mèn de téng​tòng.

   He felt a dull pain in the pit of his stomach.

   Source: Dong Chinese Dictionary