sign off

英 [ˈsaɪn ɒf]

美 [ˈsaɪn ɔːf]

（在信的结尾）写结束语; （挂电话、广播节目结束时）就说到这儿，到此为止; 注销（领取失业救济金的）登记

柯林斯词典

PHRASAL VERB (在信的结尾)写结束语;(挂电话、广播节目结束时)就说到这，到此为止
If someonesigns off, they write a final message at the end of a letter or they say a final message at the end of a telephone conversation. You can say that people such as entertainerssign offwhen they finish a broadcast.
1. O.K. I'll sign off. We'll talk at the beginning of the week...
  好，就说到这儿吧，下周初我们再谈。
2. He would sign off each week with the catch-phrase, 'I'll see thee!'
  每周结束节目时他都会说那句经典的话，“下周见！”。
PHRASAL VERB 注销(领取失业救济金的)登记
When someone who has been unemployedsigns off, they officially inform the authorities that they have found a job, so that they no longer receive money from the government.
1. If you work without signing off the dole you are breaking the law.
  如果就业后未注销领取失业救济金的登记视为触犯法律。

verb