Obs.1 [f. VAIL v.2 1 b.] The practice of lowering a staff in token of respect or as a salute.
1599. Greene, George a Greene, V. i. And for the ancient custome of Vaile staffe, keepe it still, Clayme priuiledge from me: If any aske a reason why? or how? Say, English Edward vaild his staffe to you.