earn your/its keepEARN a) to do jobs in return for being given a home and food 谋生 We older children were expected to earn our keep. 我们大一点的孩子要自己谋生。
b) to be useful enough to be worth the time or money spent 值得所花的时间[金钱] These aircraft are still earning their keep. 这些飞机依然物有所值。
earn your/its keep• As the illustration above shows, even if you just use the Family Rail Card once, it will earn its keep.
→ earn your/its keep at earn(1)