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Or "he has more than one iron in the fire"?
He is always ready for whatever comes; because he is preparing spare tools (in the metaphorical sense) and not just waiting around for what demands that he makes one.
Doing many things or activities at same time.
to be involved in several jobs or activities at the same time
To have many activities at the same time. To have many options or courses of action.
A number of jobs or possibilities available at the same time. It is recommended to keep several irons in the fire when you’re looking for work.
