'Signing for' is a term that is commonly used in situations where one is required to give their signature to confirm receipt or agreement. However, there are several other ways this expression can be conveyed in different contexts. Synonyms for 'signing for' include 'acknowledging', 'accepting', 'endorsing', 'authorizing', 'validating', 'certifying', 'initialing', 'ratifying', and 'approving'. Each of these terms conveys the act of confirming or accepting something, much like 'signing for' does. The choice of which expression to use depends on the context in which it is being used, but these synonyms can add variation and clarity to your written or verbal communication.