Noun treachery has 2 senses
  1. perfidy, perfidiousness, treachery - betrayal of a trust
    --1 is a kind of disloyalty
    --1 has particulars: insidiousness
  2. treachery, betrayal, treason, perfidy - an act of deliberate betrayal
    --2 is a kind of dishonesty, knavery
    --2 has particulars: double cross, double-crossing; sellout
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