have hand in the till
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have (one's) hand in the till
To be stealing money from one's workplace or employer. Margaret had her hand in the till for years, but she finally got caught after she claimed her two-week trip to Paris as a business expense.
have one's hand in the tilland have one's finger(s) in the till
Fig. to steal money from one's employer. James couldn't afford that car on just his salary. He must have his hand in the till. Sally was outraged when she found that one of her salesclerks had his fingers in the till.