Have, etc. your fingers in the till
Definition 1 of 1
Pro Tip 1/3Workplace Theft
This phrase specifically refers to stealing money from where one works, denoting betrayal of trust. 
She got arrested after having her fingers in the till at the cafe.
Pro Tip 2/3Figurative Speech
It's not about literal fingers or a physical till; it's a metaphor for insider theft. 
The accountant had his fingers in the till, causing the company's financial issues.
Pro Tip 3/3Negative Connotation
The phrase conveys a strong negative judgement and is often associated with disgrace. 
The community lost trust in him after he put his fingers in the till.