资料来源 : pyDict

头脑守旧的人,极端保守的人,老乌龟

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Mossback \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.]

资料来源 : WordNet®

mossback
     n : an extremely old-fashioned conservative