Explanation:

- See eye to eye is an idiom meaning to have the same opinion or to agree with someone. It suggests harmony and mutual understanding.

- Option 1: Stare at someone implies looking directly and intently at a person, often out of curiosity or rudeness. This does not relate to agreement.

- Option 2: See clearly describes having a clear vision or perception and could be used literally or metaphorically for understanding, but it doesn't mean to agree.

- Option 3: Be suspicious involves doubting someone or something and is about mistrust, contrary to agreement.

- Option 4: Agree with someone is indeed the correct meaning of “see eye to eye.”