forelock

Short definition from Wiktionary

Noun

1. 1
   The part of a person's hairstyle which covers the forehead.
2. 2
   The part of a horse's (or similar animal's) mane that lies on its forehead.
3. 3
   A wedge pushed through a hole at the end of a bolt to hold it in place.

Verb

1. 1
   To fix in place with a forelock (wedge)