The term 'I'll Second That' is a phrase used to express agreement with someone else's opinion or suggestion. The crossword solutions for this term are AMEN (4 letters), DITTO (5 letters), and YES (3 letters). AMEN is a Hebrew word meaning 'so be it' and is often used in religious contexts to express agreement with a prayer or statement. DITTO is an informal expression used to indicate agreement with something that has been said or done. Finally, YES is a simple affirmative response indicating agreement.