vail

vail
[veɪl]
verb
  1. [with obj.](archaic)take off or lower (one's hat or crown) as a token of respect or submission
    (古)(表示敬意或顺从)放(或脱)下(帽,冠)
    ■[no obj.]take off one's hat or otherwise show respect or submission to someone
    脱帽致敬
语源
  1. Middle English (originally in the sense 'lower (one's eyes, weapon, banner, etc.) as a sign of submission'): shortening of obsolete avale, from Old French avaler 'to lower', from a val 'down' (literally 'in the valley')
英语宝典
考试词汇表