Endorse
. I endorse that statement. I accept it; I fully accord with it. The allusion is to the commercial practice of writing your name on the back of a bill of exchange or promissory note if you choose to make yourself responsible for it. (Latin, in-dorsum, on the back.)
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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.