dydd Sul y pys
Welsh
Etymology
Literally, “the peas' Sunday”.
Phrase
- (idiomatic) a cold day in hell, the Greek calends (a nonexistent time)
Derived terms
- tan ddydd Sul y pys (“when pigs fly”, literally “until the peas' Sunday”)
Further reading
- R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “dydd Sul y pys”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies