What's verb/phrase to mean we deal with lots of things easily at the same time?
juggle: If you juggle lots of things, you try to give enough time or attention to all of them.It doesn't sound like a easy job when we have to "juggle" things. Is there a verb or phrase meaning we could deal with lots of things smoothly/easily/like piece of cake at the same time.

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She is good at "Multitasking." (meaning she is able to do many tasks at the same time.)

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"Good at multitasking," in some contexts you could also say someone is "good under pressure".