The crossword solutions for the term 'I'll Say!' are 'AMEN', 'Andhow', and 'Youbet'. 'AMEN' is a Hebrew word meaning 'so be it' or 'TRULY' and is often used to express agreement or approval. 'Andhow' is an informal expression of agreement, similar to 'you bet' or 'ABSOLUTELY'. Finally, 'Youbet' is another informal expression of agreement, similar to 'andhow' or 'ABSOLUTELY'. All three terms can be used to express agreement or approval with something that has been said.