Definition of turn against (or turn someone against) in US English:

turn against (or turn someone against)

phrasal verb

  • Become (or cause someone to become) hostile toward.

    ‘public opinion turned against him’
    • ‘Their idealism turns them against, not towards, the party.’
    • ‘Serena rejects the offer and Lil accuses David of turning Serena against her.’
    • ‘He had robbed Carol and now he was turning Francis against her.’
    • ‘Olympias even managed to turn Alexander against his father.’
    • ‘He turns Edward against his other elder brother George, Duke of Clarence, by libelling him with the suspicion of plotting to kill Edward, who imprisons him in the Tower.’
    • ‘She didn't want to turn them against her.’
    • ‘Didn't she realize that by turning Kelley against me she was effectively stuffing up any chance of this family being able to function in a way that would be comfortable for all of us?’
    • ‘Sutton's probably back at the Post right now turning Justin against me.’
    • ‘He breeds death and destruction, and is turning Man against Man in his love of battle and war.’
    • ‘She turned Queen Rosalind against her husband.’
    become hostile to, take a dislike to, become unsympathetic to, become disenchanted with, become disillusioned with
    make hostile to, set against, cause to dislike, cause to be unfriendly towards, prejudice against, influence against
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