If you have a handle on something, it means that you understand it and in the case of a situation, you have control of it. The structure is:
[someone] has a handle on [something]
Here are a few examples:
-The work in the lab is complicated, but I have a handle on it.
-Tom is always busy, but he seems to have a handle on his schedule.
We can also say get a handle on something, or need to get a handle on something:
-I can’t get a handle on this math problem.
-We need to get a handle on the causes of global warming.
What do you have a handle on? What do you need to get a handle on?
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