Definition of boat races:
(n) :
A race between rowing crews.
(n) :
(US, sports, slang) A contest in which one competitor boat-races the other(s)
(n) :
(Cockney rhyming slang) The face.
(n) :
(gambling, slang) A fixed horse race, with a specific horse arranged to win in advance.
(v) :
Alternative spelling of boat-race. [(US, sports, informal) to defeat by a wide margin, especially after establishing and sustaining an early lead]