/koʊ-ˈsɪɡnəˌtɔri/ – noun
Definition: người cùng ký, người đồng ký tên, bên tham gia hợp đồng.
A more thorough explanation: A co-signatory is a person who signs a document or agreement along with one or more other individuals, thereby assuming joint responsibility and liability for the obligations outlined in the document.
Example: The co-signatory on the loan agreement is equally responsible for repayment of the debt.