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Adverb: all of a sudden
  1. Without warning
    - all at once
     
  2. Happening unexpectedly
    - suddenly, of a sudden

Encyclopedia: All of a sudden

Nearest

all clear
all day long
all ears
all fired up
All Fools' day
all fours
all get out
all important
all in
all in all
all of a sudden
all over
all right
All Saints' Day
All Souls' Day
all the best
all the rage
all the same
all the time
all the way
all together