Definition of it's no use crying over spilt (or spilled) milk in US English:

it's no use crying over spilt (or spilled) milk

phrase

proverb
  • There is no point in regretting something which has already happened and cannot be changed or reversed.

    • ‘I guess it's no use crying over spilt milk, but I do remember feeling a sense of disappointment as these features were dropped from Vista.’
    • ‘‘It's obviously very disappointing when you lose your captain and inspiration but it's no use crying over spilt milk,’ said Wigan coach Dennis Betts.’