iron in the fire
iron in the fire {n. phr.}
Something you are doing; one of the projects with which a person is busy; job.
John had a number of irons in the fire, and he managed to keep all of them hot.
- Usually used in the phrase:
"Ed has a dozen things going all the time, but none of them seem to work out." "No wonder. He has too many irons in the fire."
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Source: A Dictionary of American Idioms