yr undydd

yr (“the”) + undydd (“one day”).

• (North Wales) IPA^(key): /əˈrɨ̞ndɨ̞ð/
• (South Wales) IPA^(key): /əˈrɪndɪð/
• Rhymes: -ɨ̞ndɨ̞ð

yr undydd m (uncountable)

1. (idiomatic) the same day

• yr unnos (“the same night”)

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “yr undydd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies