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set about (doing something)
To undertake a task; to begin doing something. After the meeting, I'll set about writing a draft of the report. They set about cleaning the house from top to bottom before their next guests arrived.
set someone about something
to make someone begin doing something. I set the boys about raking up the leaves. She set herself about repairing the damaged machine.
Begin, start, as in How do we set about solving this puzzle? [c. 1600]
To start doing something or some task: After collecting sticks, the campers set about building a fire.