The yellowing of the year
We were discussing Irish idioms involving colours today and one of the ones I really liked was buíú na bliana*, which literally means “the yellowing of the year” and refers to the time when spring is becoming summer and the light becomes yellower and warmer.
Red or dearg is used in expressions such as: deargbhréag, a barefaced or blatant lie; deargamadán, an utter fool; dearg-ghráin, intense hatred; and deargiomaíocht, cutthroat competition.
Black or dubh is used in such expressions as: dubh le daoine, swarming with people; and ó dhubh go dubh (from black to black), round the clock or from dawn to dusk.
I’ll put together a page of these idioms for the colours section on Omniglot.
* As I didn’t see it written down, I’m not totally sure that it’s written like this.