lollipop lady       
noun [ C ] UK informal uk/ˈlɒl.i.pɒp ˌleɪ.di/ us/ˈlɑː.li.pɑːp ˌleɪ.di/ (also lollipop woman)
 (手持车辆暂停牌以帮助学童穿越马路的)交通安全员,女导护,棒棒糖阿姨
a woman who helps children to cross the road near a school by standing in the middle of the road and holding up a stick with a round sign on it that means that the traffic must stop
  The traffic has got a lot worse since she started as a lollipop lady fifteen years ago. 自从十五年前她开始当棒棒糖阿姨以来,交通状况变得更糟糕了。 
 The school's lollipop lady says some drivers have a lot to learn.  学校的导护说,有些司机还有很多东西需要学。 
 - More examples
- I was a lollipop lady for several years.
- Because of parked cars the lollipop woman has to weave in between stationary vehicles.
- Street lighting, schools and even lollipop ladies have to be paid for.