Under-spur-leather
. An understrapper; a subordinate; the leather strap which goes under the heel of the boot to assist in keeping the spur in the right place.
“Everett and Dangerfield … were subordinate informers—a sort of under-spur-leathers as the cant term went.”—Sir W. Scott: Peveril of the Peak, chap. xii.
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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.