lower blade guard
/ˈləʊpɹˈɛʃə ˈstiːm ˈɪnlɪt/
n
English · lower blade guard中文 · 锯片下部护罩Español · guarda móvil del discoFrançais · protège-lame inférieur
意味：Retractable sheath covering the lower part of the blade, which lifts as the cut advances.