hollti'r blewyn yn bedwar ar ddeg

== Welsh == === Etymology === Literally, “to split the hair in fourteen”. === Idiom === hollti'r blewyn yn bedwar ar ddeg to lie to exaggerate ==== Related terms ==== hollti blew (“to split hairs”) === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “hollti’r blewyn”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies