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気(き)を取(と)り直(なお)す literally means “retake/recollect 気 (mind/spirit)” and figuratively “reset one’s mood”.
気 (mind) + を + 取り直す (retake)
It is often used as “気を取り直して” as in the example sentence below.
The breakfast I ate this morning was not very tasty and that turned me off, but let’s reset my mood and focus on my work.