bail arm opening mechanism
/ˈbeɪl ˈɑːm ˈəʊpənɪŋ ˈmɛkənˌɪzəm/
n
English · bail arm opening mechanism中文 · 抛线开关Español · frenoFrançais · mécanisme d’ouverture de l’anse
意味：Device used to open the bail arm so the line can unwind during a cast.