Webster's English Dictionary

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throttle

1. throt.tle \'thra:t-*l\ \'thra:t-lin, -*l-in\ \-l*r, -*l-*r\ vb or 
   throt.tling [ME throtlen, fr. throte throat] 1a1: to compress the throat of 
   : CHOKE  1a2: to kill by such action  1b: to prevent or check expression or 
   activity of : SUPPRESS  2a: to obstruct the flow of (as steam to an engine) 
   by a throttle valve  2b: to reduce the speed of (as an engine) by such 
   means  : CHOKE  - throt.tler n
2. throttle n [perh. alter. of E dial. thropple (throat)] 1a: THROAT  1b: 
   TRACHEA  2a: the valve controlling the volume of vaporized fuel charge 
   delivered to  the cylinders of an internal-combustion engine 2b: the lever 
   controlling this valve