What is the meaning of "look up"?

[Svitlana_Morokhovych]

English Language Tests, Intermediate level

ESL/EFL Test #195 "Phrasal Verbs (L)", question 10

Ray hadn't seen his friend in years, but he decided to ......... anyway.

(a) look him up
(b) look him down
(c) look him in

English Language Tests, Intermediate level

ESL/EFL Test #195 "Phrasal Verbs (L)", answer 10

Ray hadn't seen his friend in years, but he decided to look him up anyway.

Correct answer: (a) look him up

Your answer was: incorrect
Ray hadn't seen his friend in years, but he decided to look him in anyway.
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What is the meaning of "look up".

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[Mister Micawber]

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I'm glad you are enjoying yourself, Svitlana.
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