shanks' mare

or shank's mare

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noun

one's own legs, especially as a means of moving from one place to another: The only way we can get there is by shanks' mare.

Idioms

    ride shanks' mare, to go on foot rather than ride; walk: It was such a delightful day that we decided to ride shanks' mare to the fair.
Also called shanks' pony, shank's pony.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019