#detrition__friction__rubbing  effort expended in rubbing one object against another
  supertype:  elbow_grease__elbowgrease__effort__exertion__travail__sweat  use of physical or mental energy; hard work; "he got an A for effort"; "they managed only with great exertion"
  subtype:  attrition  the act of rubbing together; wearing something down by friction

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