Mag
. What a mag you are! jabberer, hence to chatter like a magpie. Mag is a contraction of magpie. The French have a famous word, “caquct-bon-bec.” We call a prating man or woman “a mag.” (See Magpie.)
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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.