k5左边的p off是什么意思

p off
P掉

例句:
1.
It's too early to say, but that exchange rate is flat, while the s& p 500 is off 7% or so.
现在此言为时尚早，但欧元对日元的汇率基本平稳，而标准普尔500指数却下滑近7%。
2.
The s& p/ asx 200 index of australian equities is off 1.9% but up 9.2% in dollars.
澳大利亚股市s&p/asx200指数下跌1.9%，按照美元换算则是上涨了9.2%。
3.
Although baby p's mother said he had fallen off the sofa, dr mackinnon wrote in her notes: "not to be allowed home. Police protection order if necessary."
虽然孩子的母亲说他曾从沙发上掉了下来，但麦金农医生还是在记录中写道：“不可留在家中，必要时可下达警察保护令。”

你说的是倒车雷达的开关。按下去就关了。off是关的意思。。。