“大刀头”一词,本是用作“还”的隐语,其典出自《汉书·李陵传》“昭帝立,大将军霍光、左将军上官桀辅政,素与陵善,遣陵故人陇西任立政等三人俱至匈奴招陵。立政等至,单于置酒赐汉使者,李陵、卫律皆待坐。立政等见陵,未得私语,即目视陵,而数数自循其刀环,握其足,阴谕之,言可还归汉也。”李陵降匈奴后,汉廷希望李陵归汉,于是派使者至匈奴劝归。汉使任立政乃李陵故旧,奉昭帝之命出使匈奴,见李陵,因有单于、卫律在座,不便明 The word “big head”, this is used as “also ” of the hidden language, the code from “Han Li Ling Biography” “Zhaodi Li, General Huo Guang, Good, sent to the deceased people Longxi Ren Lizheng and other three-person to the Hun Hunzhangling. Legislature until the arrival, set the wine to give the Han messenger, Li Ling, Wei law to be sitting. Legislative and other see the mausoleum, , And the number of its own from the knife ring, hold its foot, yin encyclical, the words can be returned to Han. ”Li Ling down Huns, Hanting hope Li Ling go back to Han, then sent messengers to the Huns persuasion. Han Ren Li-jing is the old Li Ling, Feng Zhaodi’s life to make the Huns, see Li Ling, because there is a single, Wei law is present, inconvenient