The phrase "to cancel the check" means to stop payment on a check that you have written so that it cannot be cashed or deposited by the recipient. Full definition
If asked you may need to submit additional documents or copies of cancelled checks so there is a paper trail. (rentalrookie.com)
If you have no established credit history, supply the lender with canceled checks for rent, utilities and other recurring obligations to show payment history and amount of revolving debt. (mortgage-x.com)
Include any copies of relevant documentation, such as canceled checks or invoices, to help you assert your case. (smallbusiness.chron.com)