The phrase "jump head" can be a bit confusing when it comes to spelling. The word "jump" is spelled with a /dʒ/ sound at the beginning, which represents the "j" sound. Meanwhile, "head" is spelled with a /h/ sound at the beginning, which represents the "h" sound. Combining the two creates the phrase "jump head" (/dʒʌmp hɛd/). The phrase refers to acting impulsively or without thinking things through. So, next time you see or hear "jump head," know that it's spelled with a "j" and an "h" sound.