go off 离开；进行；变质；睡去
例子：I've got rather a headache,but it will probably go off when I've had a rest.
"Go off.Beat it,you old scoundrel ." Harris said.
“走开.快滚,你这老骗子手,”哈里斯说.
The move marks intensifying interest by pharmaceutical companies in expanding into generics as their medicines go off patent.
这一举动表明,随着自研药品的专利过期,制药公司开拓非专利药品领域的兴趣日益浓厚.