Pronunciation: /ɔːl ət wʌns/
adverb simultaneously or suddenly
A1 The fireworks exploded all at once in the night sky.
A2 The students stood up from their desks all at once when the bell rang.
B1 The band members played their instruments all at once, creating a beautiful harmony.
B2 The cars on the highway suddenly stopped all at once, causing a traffic jam.
C1 The employees in the office received their bonuses all at once, leading to celebrations.
C2 The protesters raised their voices all at once, demanding change.
preposition used to indicate that something happens or is done at the same time or in a very short period of time
A1 All at once, the lights went out in the room.
A2 The children started crying all at once when they saw the clown.
B1 The alarm bells rang all at once, signaling the start of the emergency evacuation.
B2 The birds took flight all at once, creating a beautiful spectacle in the sky.
C1 The orchestra played the final crescendo, with all the instruments coming in all at once.
C2 The synchronized swimmers dived into the pool all at once, creating a stunning display of precision and grace.
formal The emergency alarms went off all at once, signaling the need for immediate evacuation.
informal I can't believe they all arrived at the party all at once, it was chaos!
slang When the boss announced the surprise bonus, the whole team cheered all at once.
figurative The realization of their mistake hit them all at once, causing a wave of regret.
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most all at once
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will all at once
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is all at once
all at once
all at once
to all at once
all at onceing
all at onceed