#foot_pedal__pedal__treadle__foot_lever  a lever that is operated with the foot
  supertype:  #lever  a rigid bar pivoted about a fulcrum
  part of:  #bicycle  #motor_vehicle  #pipe_organ
  subtype:  #accelerator_pedal__accelerator__gas_pedal__gaspedal__gas__throttle__gun  a pedal that controls the throttle valve; "he stepped on the gas"
  subtype:  #brake_pedal__brakepedal  foot pedal that moves a piston in the master brake cylinder
  subtype:  #clutch_pedal__clutch  a pedal that operates a clutch
  subtype:  #soft_pedal  a pedal on a piano that moves the action closer to the strings and so soften the sound
  subtype:  #sustaining_pedal__loud_pedal  a pedal on a piano that lifts the dampers from the strings and so allows them to continue vibrating

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