Focus on the pronunciation of sign
English definition of “sign”
/sɑɪn/ v [I/T] (WRITE)
› to write your name on a document to show that you agree with it or that you have written it yourself: [T] to sign a letter/contract/check [I] Please sign for the package when it arrives (= write your name on a form to show that you have received it). › If an organization signs someone, that person has officially become a member of the organization by agreeing to a contract: [T] The team signed four new players this week.