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Verb: overmaster  ,ow-vu(r)'mãs-tu(r)
  1. Overcome by superior force
    "The army overmastered the rebels after a long siege";
    - overpower, overwhelm

Derived forms: overmastered, overmastering, overmasters

Type of: beat, beat out, crush, shell [US], trounce, vanquish

Encyclopedia: Overmaster