Webster's Revised Unabridged Dictionary · 1913

Vail

Vail (vāl) , noun and transitive verb

Same as Veil. [Obsolete]

Vail , noun

[Aphetic form of avail, n.]

1.
Avails; profit; return; proceeds. [Obsolete]
My house is as 'twere the cave where the young outlaw hoards the stolen vails of his occupation. — Chapman
2.
An unexpected gain or acquisition; a casual advantage or benefit; a windfall. [Obsolete]
3.
Money given to servants by visitors; a gratuity; -- usually in the plural. — Dryden

Vail , transitive verb

[Aphetic form of avale. See Avale, Vale.]

1.
To let fall; to allow or cause to sink. [Obsolete]
Vail your regard Upon a wronged, I would fain have said, a maid! — Shakespeare
2.
To lower, or take off, in token of inferiority, reverence, submission, or the like.
France must vail her lofty-plumed crest! — Shakespeare
Without vailing his bonnet or testifying any reverence for the alleged sanctity of the relic. — Sir. W. Scott

Vail (vāl) , intransitive verb

To yield or recede; to give place; to show respect by yielding, uncovering, or the like. [Obsolete]
Thy convenience must vail to thy neighbor's necessity. — South

Vail , noun

Submission; decline; descent. [Obsolete]