Definition of have seen it all before in US English:

have seen it all before

phrase

  • Be very worldly or very familiar with a particular situation.

    • ‘Don't be embarrassed if this happens to you; maternity staff have seen it all before!’
    • ‘They have that knowing look of people who have seen it all before.’
    • ‘Their manager is one of the most experienced around and has seen it all before.’
    • ‘Washingtonians have seen it all before and they're not impressed.’
    • ‘He portrays the wise Detective Sean Harrison, who has seen it all before.’
    • ‘Black, who has seen it all before, is much more cynical.’
    • ‘They had seen it all before and were having no part of it.’
    • ‘I have seen it all before, and, based on the current form of both teams, I know when not to make glib forecasts.’
    • ‘I thought it was ironic because we had seen it all before.’
    • ‘After 12 Wimbledons, seven of which he's won, the 29-year-old has seen it all before.’