twll tin

== Welsh == === Alternative forms === twll y din === Etymology === Literally, “arse's hole”. === Noun === twll tin m (plural tyllau tinnau) arsehole, anus Synonyms: anws, rhefr ==== Derived terms ==== twll tin byd (“the arse end of nowhere, the back of beyond”) === Further reading === D. G. Lewis, N. Lewis, editors (2005–present), “twll”, in Gweiadur: the Welsh–English Dictionary, Gwerin R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “twll tin”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies