in English is:

once

Phrases (10)
anadlu unwaith eto
dwywaith yn blentyn ac unwaith yn ddyn
fwy nag unwaith
gwell gofyn dengwaith na methu unwaith
llosgi unwaith, cofio ganwaith
unwaith ac am byth
unwaith eto
unwaith yn unig y mae twyllo un call
unwaith yn y pedwar amser
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