vail
noun
1. (obsolete) profit; return; proceeds.
2. (chiefly in the plural, obsolete) Money given to servants by visitors; a gratuity; also vale.
3. (obsolete) submission
4. Archaic form of veil.
verb
1. (intransitive, obsolete) To yield.
2. (transitive, obsolete) To remove as a sign of deference, as a hat.
3. To let fall; to allow or cause to sink.
4. Archaic form of veil.