See? “By” originally means “bye” or byway. That’s why, in fact, some people still spell “by the by” as “by the bye”. By the way, “that is by the by or bye” in this sense (secondary) is an idiom that ...

The Hong Kong International Horse Show will run from February 14 to 16 at AsiaWorld-Expo. This equestrian event is held in Hong Kong for the first time, with a prize money of up to HK$6.5 million.