To avoid upsetting his grandma, he decided to humour her by watching traditional opera with her.

### 解释 humour 在这里是动词，意思是"迁就、迎合"，指为了让对方高兴而顺从对方的意愿或喜好。这个词源自名词 humour（幽默），用作动词时引申为"用幽默或顺从的方式取悦他人"。