To endorse a cheque means to write and sign one's name on the back of the cheque. This signifies that the payee, the person to whom the cheque is payable, has authorized the transfer of the cheque to another party. The endorsement creates a legal transfer of the cheque from the payee to the endorsee, the person to whom the cheque is being transferred.
Endorsing a cheque is a common practice in business and personal transactions. It is usually done when the payee wants to transfer the cheque to a third party, such as a supplier or creditor. By endorsing the cheque, the payee is authorizing the transfer of funds from their account to the account of the endorsee.
In summary, to endorse a cheque means to write and sign one's name on the back of the cheque, authorizing the transfer of the cheque to a third party.