Used in the jocular phrase to give (Sc. take) leg-bail, to run away, decamp: see BAIL sb.1 5 c. Hence sometimes used (in allusion to this phrase) = unauthorized absence or departure, ‘French leave,’ etc.

1

1774.  Fergusson, Poems (1807), 234. They took leg-bail and ran awa Wi’ pith and speed.

2

1785.  Grose, Dict. Vulg. Tongue, s.v. Leg, To give leg bail and land security, to run away.

3

1808.  Sporting Mag., XXXII. 122. We have more occasion … for leg-bail than they have.

4

1861.  Hughes, Tom Brown at Oxf., xi. (1889), 107. [He] was giving them leg bail as hard as he could foot it.

5

1889.  Century Mag., Feb., 632/1. Judgment was enforced by the scalping-knife, with leg-bail or a tribal warfare as a court of last resort.

6