Webster's English Dictionary

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expiate

ex.pi.ate \'ek-spe--.a-t\ \-.a-t-*r\ vb [L expiatus, pp. of expiare to 
   atone for, fr. ex- + piare)X to atone for, appease obs  1: to put an end to 
    2a: to atone for  2b: to pay the penalty for  2c: to make amends for  : to 
   make expiation  - ex.pi.a.tor n