forelock
noun [ C ] uk/ˈfɔː.lɒk/ us/ˈfɔːr.lɑːk/
额发;（马的）额毛，门鬃
a piece of hair that grows or falls over the forehead (= part of the face above the eyes) or the part of a horse's mane that falls forward between its ears
Idiom
tug at/touch your forelockidiom 毕恭毕敬
to show respect to someone in a higher position than you in a way that seems old-fashioned