get one's hands on / lay one's hands on: to get something for the purpose of doing harm; to succeed in obtaining something

Examples:

1. Putting your wallet in your back pocket can make it easy for thieves to get their hands on it.

2. How my little brother was able to get his hands on my diary is still a mystery to me. 

3. If his wife sees a new pair of shoes. He just knows she will lay her hands on it.

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