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Unexpectedly; without warning; all of a sudden.

When all at once I saw a crowd, A host, of golden daffodils - William Wordsworth, Daffodils.

Additional definitions for 'all at once':

all at onceAll at the same time; all together.
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"all at once." STANDS4 LLC, 2018. Web. 21 Sep. 2018. <>.

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