forelock
n
1 piece of hair growing (and falling) over the forehead 额发.
2 (idm 习语) touch, tug, etc one´s `forelock (formerly) raise a hand to one´s forehead when meeting sb of higher social rank, usu as a sign of respect (旧时)(与地位高的人相见时)将一只手举至额头(通常指致敬).