"see eye to eye" is a classic way to express that you completely agree with someone or share the exact same opinion on a topic
When you see eye to eye with another person, you are "on the same page" and have a mutual understanding. Interestingly, it is very commonly used in the negative to describe a polite disagreement.
It is perfect for casual or professional conversations (like discussing a project with a colleague), but you should avoid it in highly formal legal documents or scientific reports.
The phrase is quite old and is believed to have biblical roots. It first appeared in the Book of Isaiah (52:8), describing watchmen who would "see eye to eye" when they witnessed the return of the Lord to Zion. While it originally meant seeing something face-to-face or directly, it evolved over centuries into the metaphorical meaning of shared perspective we use today.
"After hours of discussion, the committee finally saw eye to eye on the new budget."
"My brother and I are close, but we rarely see eye to eye on politics."
