Je was op zoek naar: fad (Engels - Wels)

they said that the lottery would be a passing fad and would fizzle out within a few years
dywedasant mai chwiw dros dro fyddai'r loteri ac y byddai'n mynd i'r gwellt o fewn ychydig flynyddoedd

the leader of the welsh conservatives ( nick bourne ) : minister , was not the approach of your predecessor , rosemary butler , the right one ? she would have nothing to do with this titty nonsense , which has only been brought in because of a liberal democrat fad
arweinydd ceidwadwyr cymru ( nick bourne ) : weinidog , onid oedd ymagwedd eich rhagflaenydd , rosemary butler , yn gywir ? nid oedd yn fodlon cael dim i'w wneud â'r nonsens hwn , sydd ond wedi ei gyflwyno oherwydd chwiw'r democratiaid rhyddfrydol