to look up (a name, some information) : to search for, to try and find, to seek (a name, some information)
I didn't have any information about Napoleon, so I looked him up at the library and found a lot of info.
to look up to (one's sister): to respect, to admire, to cherish, to aspire to be like (one's sister)
to look up: to look towards the sky, to see upwards, to point one's eyes up
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