柯林斯词典penknife /ˈpɛnˌnaɪf/ (penknives) 1. N-COUNT A penknife is a small knife with a blade that folds back into the handle. 小折刀 返回 penknife剑桥词典a small knife that folds into a case and is usually carried in a pocket 袖珍折刀 返回 penknife