Definition
Time available when one is free from work or other duties.
空闲时间
She uses her spare time to learn new programming languages.
她利用空闲时间学习新的编程语言。
I enjoy reading novels in my spare time.
我喜欢在空闲时间阅读小说。
They go hiking together in their spare time.
他们在空闲时间一起爬山。