Definition of look someone up in US English:

look someone up

phrasal verb

informal
  • Make social contact with someone.

    • ‘Do look us up again when you are in America - perhaps next year.’
    • ‘Sometimes, an Italian friend on a visit to London would look him up.’
    • ‘I'd lost touch with him, and was meaning to look him up.’
    • ‘If you're in Berlin, promise to look us up.’
    • ‘Alena accepted the invitation to look him up when she came on her planned visit to Dawson that summer.’
    • ‘I said I was an old friend and I'd come to visit York and wanted to look him up.’
    • ‘We have got a young chef just starting college and Anthony gave him his number and asked him to look him up if he was in the area, which made his day.’
    • ‘We emailed for a bit too but are now out of contact - I should probably look her up again some time.’
    • ‘Man, I seriously need to look you up when I come visit my parents in Spring.’
    • ‘If you are every going through central Kentucky look me up.’
    visit, pay a visit to, call on, go to see, look in on
    View synonyms