catflap.org Online Dictionary Query

  taper out /tˈeɪpəɹ ˈaʊt/
  ausdünnen, auskeilen, dünner werden  [min.]
     Synonyms: wedge out, thin away, thin out, edge away, pinch out, die away, end off
  
   see: wedging out, thinning away, thinning out, tapering out, edging away, pinching out, dying away, ending off, wedged out, thinned away, thinned out, tapered out, edged away, pinched out, died away, ended off