headfirstOur editors are putting together more complete content — check back in about 20 minutesheadfirstheadfirst — adverb副詞1. with the head going first into something1.副詞釋義with the head going first into something例句He dove headfirst into the pool.2. in a quick and careless way2.副詞釋義in a quick and careless way例句She rushed headfirst into the new project.