Definition of vail in English:

vail

verb

[WITH OBJECT]archaic
  • 1 Take off or lower (one's hat or crown) as a token of respect or submission.

    • ‘Turning himself towards the noblemen that sat on a form placed before the scaffold, he vailed his hat.’
    • ‘Vailing his cap, like them, to the Queen's representatives, he covered himself when he looked at the Pope's delegate.’
    • ‘He vailed his bonnet to no one but a judge.’
    1. 1.1[no object] Take off one's hat or otherwise show respect or submission to someone.

Origin

Middle English (originally in the sense ‘lower (one's eyes, weapon, banner, etc.) as a sign of submission’): shortening of obsolete avale, from Old French avaler to lower, from a val down (literally in the valley).

Pronunciation:

vail

/veɪl/