Definition of "look up"

look up

verb
third-person singular simple present looks up, present participle looking up, simple past and past participle looked up
1. Used other than figuratively or idiomatically: see look,‎ up.
2. (intransitive, idiomatic) To have better prospects.
3. (transitive, idiomatic) To obtain, or seek to obtain, information about something.
  Quotations
  "Why do you know about transgender stuff? Did you look it up because of me?" "Oh no. I find wanting to change forms totally normal. It never would've occurred to me."
  2014 July 16, Dan Shive, El Goonish Shive (webcomic), Comic for Wednesday, Jul 16, 2014
  1. To obtain information about something from a reference book.
  2. To enter a query into a database or search engine.
4. (transitive, idiomatic) To reconnect or meet with someone that one used to know.
  Quotations
  Look me up next time you’re in town—if you can bring me some new ideas.
  1914, Rupert Hughes, Clipped Wings