catflap.org Online Dictionary Query

  gain speed /ɡˈeɪn spˈiːd/
  an Geschwindigkeit zunehmen, schneller werden
     Synonym: gather speed
  
   see: speed, minimum speed, rotation speed, screw speed, permissible speed, breakaway speed
  

  gain speed /ɡˈeɪn spˈiːd/
  an Fahrt gewinnen [auto]
   see: gain sth., gain in sth., gaining, gaining in, gained, gained in, gain altitude, gain weight, gain in importance, gain in popularity