Definition of get (or stick) the knife into (or in) someone in English:

get (or stick) the knife into (or in) someone

phrase

informal
  • Be malicious or vindictive towards someone.

    • ‘She stuck the knife into her ex-lover and twisted it with a ruthlessness that made every other dispute between politicians - whether personal or professional - appear tame by comparison.’
    • ‘And you're prepared to stick the knife into Anderson at any opportunity.’
    • ‘While she will not stick the knife into her former government colleagues - like previous women leaving senior office, that is not her style - she accepts politicians too must change.’
    • ‘When Charley said Zac had asked her out for a drink, it was a deliberate attempt to stick the knife into me.’
    • ‘But if it were intended as a way of subtly sticking the knife into Mr Cameron, it seems to have failed.’
    • ‘I believe if you have an artist come in for an interview it pays to be nice to them and not to stick the knife into them.’