The term 'On the Say-So Of' can be summarized as meaning to do something based on the instructions or orders of someone else. This phrase is often used in legal contexts, where a person is required to act on the instructions of another person, such as a court order or a contract. The crossword solution for this term is 'ASPER', which is an acronym for 'As Per'. This phrase is often used to indicate that something should be done according to the instructions of someone else.