E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Trouble
means a moral whirlwind. (Latin, turbo, a whirlwind; Italian, turbare; French, troubler.) Disturb is from the same root. The idea pervades all such words as agitation, commotion, vexation, a tossing up and down, etc.
