Pi/osa a chum Po/l.
Co/iraithe aige fe/in agus ag Ciara/n. [ Lyrics from: http://www.lyricsmode.com/lyrics/c/clannad/ni_la_na_gaoithe_la_na_scoilb.html ]
Don't thatch on a windy day. Elsewhere on the net this has been translated as "don't put off till to morrow ... " when if anything it means the opposite - ni(it is not) la(the day) na gaoithe (of the wind) la (the day) na scoilb (of the pins used for fixing the thatch)