ret·ro·grade /ˈrɛtrəˌgred/
 (a.)後退的,倒退的,退步的(vi.)倒退,退步,逆行


 ret·ro·grade /ˈrɛtrəˌgred/ 形容詞
 退行性的,惡化的,逆行的


 Re·tro·grade a.
 1. Astron. Apparently moving backward, and contrary to the succession of the signs, that is, from east to west, as a planet.
    And if he be in the west side in that condition, then is he retrograde.   --Chaucer.
 2. Tending or moving backward; having a backward course; contrary; as, a retrograde motion; -- opposed to progressive. “Progressive and not retrograde.”
    It is most retrograde to our desire.   --Shak.
 3. Declining from a better to a worse state; as, a retrograde people; retrograde ideas, morals, etc.


 Re·tro·grade, v. i. [imp. & p. p. Retrograded p. pr. & vb. n. Retrograding.]
 1. To go in a retrograde direction; to move, or appear to move, backward, as a planet.
 2. Hence, to decline from a better to a worse condition, as in morals or intelligence.

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 retrograde
      adj 1: moving from east to west on the celestial sphere; or--for
             planets--around the sun in a direction opposite to
             that of the Earth [ant: direct]
      2: of amnesia; affecting time immediately preceding trauma
         [ant: anterograde]
      3: going from better to worse [syn: retrogressive]
      4: moving or directed or tending in a backward direction or
         contrary to a previous direction [syn: retral]
      v 1: move backward in an orbit, of celestial bodies
      2: move in a direction contrary to the usual one; "retrograding
         planets"
      3: move back; "The glacier retrogrades" [syn: retreat]
      4: go back over; "retrograde arguments" [syn: rehash, {hash
         over]
      5: get worse; fall back to a previous or worse condition [syn:
         regress, retrogress] [ant: progress]