noun submission; decline; descent.
2. vail ·noun avails; profit; return; proceeds.
3. vail ·vt to let fail; to allow or cause to sink.
4. vail ·noun & ·vt ·same·as veil.
5. vail ·noun money given to servants by visitors; a gratuity;
usually in the plural.
6. vail ·noun an unexpected gain or acquisition; a casual advantage or benefit; a windfall.
7. vail ·vt to lower, or take off, in token of inferiority, reverence, submission, or the like.
8. vail ·vi to yield or recede; to give place; to show respect by yielding, uncovering, or the like.