a large bird that could not fly and that is now extinct (= no longer exists) 渡渡鸟（不能飞行，现已灭绝） - (North American English)
a stupid person 笨人；蠢人
Word Originearly 17th cent.: from Portuguese doudo ‘simpleton’ (because the bird had no fear of man and was easily killed).
Idioms
(as) dead as a/the dodo
- (British English, informal)
completely dead; no longer interesting or relevant 完全过时；不再引人注目；失效 In the second half both teams made substitutions to try and liven things up, but the game was as dead as a dodo. 下半场，两队都换人，试图活跃气氛，但比赛毫无生气。
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- (as) blind as a bat
- (as) bright as a button
- (as) bold as brass
- as busy as a bee
- as clean as a whistle
- (as) dead as a/the dodo
- (as) deaf as a post
- (as) dull as ditchwater
- (as) fit as a fiddle
- as flat as a pancake
- (as) good as gold
- (as) mad as a hatter/a March hare
- (as) miserable/ugly as sin
- as old as the hills
- (as) pleased/proud as Punch
- as pretty as a picture
- (as) regular as clockwork
- (as) quick as a flash
- (as) safe as houses
- (as) sound as a bell
- (as) steady as a rock
- (as) thick as two short planks
- (as) tough as old boots