Definition of not trust someone as far as one can throw them in US English:

not trust someone as far as one can throw them

phrase

informal
  • Not trust or hardly trust a particular person at all.

    • ‘For one thing, I still don't trust Hawkins as far as I can throw him.’
    • ‘I would not trust that guy as far as I can throw him, and well, I am small and not strong- so I hope that makes my point.’