Archaic.to take off or doff (one's hat), as in respect or submission.
Origin: 1300–50;Middle Englishvalen, aphetic variant of avalen (now obsolete) < Middle Frenchavaler to move down, verbal derivative of phrase a val down (literally, to the valley) (a to (< Latinad) + valvale)
to lower (something, such as a weapon), esp as a sign of deference or submission
2.
to remove (the hat, cap, etc) as a mark of respect or meekness
[c14 valen, from obsolete avalen, from Old French avaler to let fall, from Latin ad vallem, literally: to the valley, that is, down, from ad to + vallisvalley]