Brewer's: Humour

As good humour, ill or had humour, etc. According to an ancient theory, there are four principal humours in the body: phlegm, blood, choler, and black bile. As any one of these predominates it determines the temper of the mind and body; hence the expressions sanguine, choleric, phlegmatic, and melancholic humours. A just balance made a good compound called “good humour;” a preponderance of any one of the four made a bad compound called an ill or evil humour. (See Ben Jonson. Every Man Out of His Humour (Prologue).)

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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