Chinese Test: What does “死心 (sǐ xīn)” mean?

Beginner Level 初级 (chūjí)

Conversation:

Tom has been courting Lily for several months, but Lily refused him. One day, Tom’s friend Jack saw him buying a large bouquet of roses.          Nǐ hái méi sǐ xīn a? Jack: 你还 没    死心啊?

         Děngzhe qiáo ba, tā yídìng …