Definition of run out on in US English:

run out on

phrasal verb

informal
  • Abandon (someone); cease to support or care for.

    • ‘There has to be a good reason why she ran out on him.’
    • ‘I love my daughter, you're the one who ran out on her.’
    • ‘He couldn't stand the fact that she ran out on him last night.’
    • ‘Taylor's mother recently ran out on her and her father, so things at home haven't been the best.’
    • ‘You're not going to run out on me now, are you?’
    • ‘My mom said that my father ran out on her and that he was a bastard.’
    desert, abandon, leave in the lurch, jilt, leave high and dry, discard, cast aside, throw over, turn one's back on
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