“Louise has been killing it!”
You're in charge of a sales team. One of the salespeople on your team has sold a lot this week. Now you're in a team meeting. You want to tell everyone about her good performance.
Louise has been killing it!
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(someone) has been (doing something)
Use "has been ___ing" to talk about something that started in the past, continued without stopping or happened again and again, and is still going on now:
You've been sitting there at your computer for over two hours.
I've been designing web pages for over ten years.
Or you can use it for a situation that you're not sure whether it's finished or it's going to continue:
It's been cloudy all morning, but it looks like the sun might come out soon.
(someone) is killing it
This is a slang expression that means that someone is doing very, very well.
Use this to talk about people succeeding, not just a little but a lot, in things like:
- sports
- sales
- grades in school
Young people in their 30's or below are most likely to use this expression. Although it uses the word "kill", it doesn't really have a violent association. However, it does have an active, aggressive feel to it.
By the way, you always use "it" in this phrase. You shouldn't replace "it" with another noun.