E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Measure.
Out of all measure. Outre mesure. Beyond all reasonable degree, Præter (or supra) modum.
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Thus out of measure sad.Shakespeare: Much Ado About Nothing, i.3.
To take the measure of ones foot. To ascertain how far a person will venture; to make a shrewd guess of anothers character. The allusion is to Ex pede Herculem.