İngilizce böyle bir kelime varmış de ve farsçadan ingilizceye geçmiş..
Yarak, noun. (Now rare) A state of eagerness to hunt.
Raptors eager for the hunt are sometimes referred to as being "in yarak."
This word, probably borrowed from the Persian word yaraki (meaning "ability, power, or strength"), became used less often when keen started to grow in popularity.
WikiAnswers - What does the word Yarak mean
yarak Superalert, hungry but not weak, and ready to hunt