VAIL (2)

vail (2). Vail, v. to cover, hide, let fall, yield, give place

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