moss·back /ˈmɔsˌbæk/
頭腦守舊的人,極端保守的人,老烏龜
Moss·back n. A veteran partisan; one who is so conservative in opinion that he may be likened to a stone or old tree covered with moss. [Political Slang, U.S.]
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mossback
n : an extremely old-fashioned conservative