I am tired of this job and want to jack it in.
jack in
idiomTo stop doing a regular activity, such as a job or studying.
He hated the long hours at the office, so he decided to jack in his position and travel.
After years of struggling to find success in the industry, she finally decided to jack in her career and pursue a quiet life in the countryside.
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come from a Cracker Jack box
To obtain or retrieve something that is useless, cheap or fake.
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jack of all trades
One competent in many endeavours, sometimes regarded as not excelling in any of them.
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jack of all trades, master of none
A person who has a competent grasp of many skills but who is not outstanding in any one.
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Jack Tar
Alternative letter-case form of jacktar.