get a 'handle，have a 'handle，givee a 'handle (使)弄懂,理解,明白

bca

关于handle习惯用语的例句：
However, his mother didn't know that when she went to the police the following week to get a handle on what had happened to her son.

▪ get / have a 'handle on sb / sth   

(informal)  to understand or know about sb / sth, especially so that you can deal with it or them later
   弄懂；理解；搞明白:
   I can't get a handle on these sales figures.
   我搞不懂这些销售数字。
▪ give sb a 'handle (on sth)  

  (informal)  to give sb enough facts or knowledge for them to be able to deal with sth
   (使)弄懂,理解,明白

get a handle on sth,  to start to understand a situation, subject etc
• 开始掌握（了解）某事:
»It's difficult to get a handle on how widespread this problem is.
  想要了解这个问题的普遍性并不容易。

注意区别另一个用法 fly off the handle

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fly off the handle
[informal] to suddenly get very angry
• 大发雷霆:
»Calm down – there's no need to fly off the handle.
  冷静一点 — 没有必要大发雷霆。