ôl a blaen

== Welsh == === Etymology === Literally, “back and forth”. === Adverb === ôl a blaen back and forth, to and fro ==== Derived terms ==== tocyn ôl a blaen (“return ticket”) === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “ôl a blaen”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies