Cap (the verb)
. I cap to that, i.e. assent to it. The allusion is to a custom observed in France amongst the judges in deliberation. Those who assent to the opinion stated by any of the bench signify it by lifting their toque from their heads.
“Well, that caps the globe.”—C. Brontë: Jans Eyre.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.