admire, be impressed by someone; model oneself after someone (usually an older person)
If you look up to someone, especially someone older than you, you respect and admire them. You're a popular girl, Grace, and a lot of the younger ones look up to you. = admire
[ t&, tu, 'tü ] (preposition.) before 12th century. Middle English, from Old English tO; akin to Old High German zuo to, Latin donec as long as, until.