The term 'I Couldn't Agree More' is often used to express agreement with someone else's opinion. The crossword solutions for this term are 'AMEN' (4 letters), 'SoTrue' (6 letters), and 'AmenToThat' (10 letters). 'AMEN' is a Hebrew word that is commonly used in religious contexts to express agreement or approval. 'SoTrue' is an informal expression of agreement, while 'AmenToThat' is a combination of the two words, expressing agreement even more strongly.