This is the 288th most frequent Hebrew word.
בראש
The Hebrew word "בראש" means "at the head" or "in the beginning," depending on context.
Here "בראש" means "at the head" or "leading," referring to a physical or metaphorical leadership position.
הוא עמד בראש הקבוצה וניהל את הפגישה.
He stood at the head of the group and led the meeting.
In this sentence, "בראש" is part of "מהראש" meaning "from my head" (literally "from the head"), referring to one's mind or thoughts.
המחשבות על הפרויקט לא יוצאות לי מהראש.
The thoughts about the project won't leave my head.
"בראש" is part of "בראש השנה," which means "On Rosh Hashanah" (literally "At the beginning of the year"), referring to the Jewish New Year.